Climate change has the odd effect of making many of us inordinately excited about appliances we never used to care about. Suddenly, all the background machines, which have up to now been unconsciously powering our lives, have taken on outsized importance. Some of them have the potential to provide the essential services we depend on while, at the same time, not destroying our planet like the fossil fuel powered machines of the 19th and 20th centuries.
Ductless heat pumps are a prime example. In the past, many of us used gas furnaces and boilers to heat our homes and burned fuels that emitted copious amounts of CO2 in the process. Now, with the magical heat pump, we have access to efficient electric technologies for heating and cooling that can be powered entirely by renewable energy, and thus be carbon neutral.
Photo courtesy of The Heat Pump Store
Brief History and Growth of Ductless Heat Pumps
Ductless heat pumps (DHPs) were developed in Japan after World War 2. They were invented and perfected on an island that doesn’t have easy access to fossil fuels, and so they are the ideal heating/cooling system for our modern world given they don’t rely on combustion and are also incredibly efficient.
They condition 90% of Japanese homes, and worldwide their usage is growing like crazy, with an expected doubling of heat pump sales in the next five years. In the UK, sales are projected to increase 20 fold, and in the US, some areas are seeing sales growth north of 40% every year.
My family has used ductless heat pumps for our heating and cooling since 2012 when we bought our house. The gas furnace that came with our house was old, and we made the decision to replace it with new ductless heat pumps. (A major perk is that mounting the units on the wall saved valuable floor space in the garage, formerly dedicated to the gas furnace, which we converted into an apartment). We had seen them used in Europe and figured, even 9 years ago when the electrification movement was in its infancy, that heating with efficient electricity would allow us to reduce our carbon emissions with the solar panels we planned to install on our roof.
Photo from Joe Wachunas
What is Ductless?
But what is a Ductless Heat Pump (a.k.a. mini-split)? Basically, it is a heating/cooling system that is different from a traditional furnace in several ways:
1. DHPs don’t have air ducts. Rather than forcing hot air through potentially leaky ducts, ductless systems place an indoor device on a wall and an outdoor unit (similar to a typical AC unit) which provides heating and cooling. This means no air escapes through leaky ducts, creating more efficient conditioning.
Indoor unit. Photo Courtesy of The Heat Pump Store.
2. DHPs don’t burn things. Ductless heat pumps use electricity to provide heating and cooling. Electricity is rapidly moving towards being fully renewable and thus will soon produce zero emissions (the Biden administration set a goal of 2035 for example).
3. DHPs are like refrigerators in reverse. Instead of burning fuel, ductless heat pumps create heating and cooling through refrigeration. This means they capture heat from outside (even when it’s cold) and move it into your house, and vice versa for cooling. It’s pretty magical. The refrigerants used by DHPs can be potent greenhouse gases themselves, but luckily the world is moving quickly to using better, more environmentally friendly refrigerants (check out this website for a new type of refrigerant called R32).
Refrigerant lines from ductless heat pumps. Photo courtesy of The Heat Pump Store.
4. DHPs are incredibly efficient. This is because a) no air leaks through ducts b) they heat the room they are in (rather than the whole house), c) moving heat is vastly more efficient than creating it, and d) they use inverter systems (see below). As a result, they typically use three times less energy than old electric resistance heaters and six times less than gas.
Demystifying a couple DHP terms
Speaking of efficiency, let’s demystify a couple of terms associated with ductless heat pumps.
SEER — SEER is a number that measures how well a technology provides cooling. The higher the number, the more efficient the unit. Most new air conditioners have a SEER between 13 and 21, but ductless can often see a SEER over 30, which gives you an idea of how efficient they are. If you’re in a warm climate, SEER is especially important.
HSPF — HSPF stands for Heating Season Performance Factor and complements the SEER rating in that it measures how efficiently a heat pump heats a space. The minimum required HSPF rating in the US is 7.7. An 8.5 score is considered good, and over 10 is excellent. If you’re in a cooler climate, where the predominant energy use is for heating, HSPF is most important.
Example of SEER and HSPF ratings
I interviewed Tim Sharp, from the Heat Pump Store here in Oregon, which has installed thousands of ductless heat pumps over the last decade. He said that you’ll want your DHP to be most efficient in heating if you’re in a cold climate, and cooling if you’re in a warm climate. People in the northern US should probably focus on HSPF, while in the southern US, people should focus on SEER. Tim also said that investing in a DHP with higher scores will be more expensive up front, but the additional cost usually pays for itself over time through energy savings.
Ductless Heat Pumps in Cold weather
I also learned from Tim that DHPs were originally developed to provide only cooling (like a refrigerator), yet they have “constantly gotten better for heating purposes in almost every environment.” If you’re in a cold climate, you probably want to think about the “extended capacity” models, which are able to provide more heating. According to Tim, they don’t cost significantly more and offer more BTUs per hour output. Read more on how to use heat pumps in cold climates here.
Ductless vs. Ducted
If you have existing ductwork in a space, you may consider a different approach when transitioning to heat pumps. Not all heat pumps are ductless. You can get central heat pumps that work with a typical central AC system, and provide heating that blows that hot air through ducts. These central heat pumps are not much more expensive than central air conditioning, and many people think that swapping out every central AC system for a ducted heat pump is an important strategy to quickly get us off natural gas and reduce carbon emissions.
Ductless, on the other hand, is a no-brainer when you’re adding heating or cooling to a room without any ductwork. And DHPs also offer greater efficiency as well as economic and environmental advantages over a central ducted heating system. In addition to the efficiencies mentioned above, ductless heat pumps use inverter technology, which means they run at variable speeds. Tim from the Heat Pump Store compares this to starting your car at a red light. Inverters slowly rev the engine when starting and stopping, while typical central AC systems gun it and brake hard, meaning they are much less efficient. All DHPs use inverter technology, while virtually all conventional (ducted) heat pumps don’t, meaning DHPs are much more efficient.
My family chose ductless heat pumps in our house, rather than a whole house heat pump, even though we had existing ductwork from our old gas furnace because of the increased efficiency.
Photo courtesy of The Heat Pump Store
Humidity and air quality
Though ductless heat pumps help to dehumidify a room, it is not their primary purpose. In places with humidity problems, a separate dehumidifier may still be necessary. Similarly, DHPs have built in air filters, but can’t generally filter air to the extent that ducted systems do with high rated MERV filters. Tim from The Heat Pump Store said that air filtering is considered a separate system, from heating/cooling, in places where heat pumps are most prevalent, and people typically buy another device for air filtration.
Brands
There are four leading brands of ductless heat pumps: Mitsubishi, Fujitsu, LG, and Daikin. Most of the top brands are Japanese, given they first developed the technology. This NY Times article has some solid reviews on each of these four brands.
Choosing a contractor
Finding a good installer is important. Many contractors may try to talk you out of electric heating and cooling (and into gas). Plus, you’ll want someone to help you correctly size a system for your needs. That means someone with lots of experience in ductless heat pump systems as well as a good reputation and reviews. Getting three bids is always a solid strategy. One pro tip is to look on a manufacturer’s page for contractors in your area that are certified to install their product.
Photo Courtesy of The Heat Pump Store
Cost and Aesthetics
As Tim told me in our interview, ductless heat pumps aren’t a panacea. Any technology has its downsides. As my wife points out, the indoor equipment that sits high on your wall takes up space and isn’t the most beautiful thing in the world. Ductless Heat Pumps can also be expensive. A system with a single indoor unit can run $3,000–$5,000, but if you’re putting multiple “heads” throughout your house, costs can quickly go over $10,000.
Yet, for me, after 9 years of heating and cooling our house with ductless heat pumps, and with the climate emergency we find ourselves in, any drawbacks to ductless heat pumps are vastly outweighed by their immense benefits. Heat pumps are the heating and cooling technology for this era of climate change, and ductless heat pumps are the most efficient versions of this technology. They allow us to get off fossil fuels and efficiently heat and cool, in any climate, with clean electricity.
Learn more and do a deep dive into Ductless Heat Pumps with Tim from the Heat Pump Store in a recent webinar I hosted with Electrify Now, and let us know about your thoughts and experiences with ductless heat pumps in the comments below!
In a landmark shift for the U.S. housing finance system, the Federal Housing Finance Agency has issued a directive ordering Fannie Mae and Freddie Mac to formally consider cryptocurrency as an asset in single-family mortgage loan risk assessments.
The move, signed by FHFA Director William J. Pulte on Wednesday, signals a new era of crypto integration into traditional financial infrastructure — this time within the core of American home lending.
The order directs both housing finance giants to develop proposals that include digital assets — without requiring borrowers to liquidate them into U.S. dollars prior to a loan closing.
Pulte said in a post on X that the move aligns with President Donald Trump‘s vision “to make the United States the crypto capital of the world.”
Historically, cryptocurrency has been excluded from underwriting frameworks due to volatility, regulatory uncertainty, and the inability to easily verify reserves. This directive changes that.
Read more CNBC tech news
The decision comes at a time of increasing institutional embrace of crypto across banking, payments, and federal policy.
“Cryptocurrency is an emerging asset class that may offer an opportunity to build wealth outside of the stock and bond markets,” the order states, acknowledging crypto’s growing role in household financial portfolios.
The directive restricts consideration to digital assets that are stored on U.S.-regulated, centralized exchanges and can be clearly evidenced. It also requires Fannie Mae and Freddie Mac to develop internal adjustments to account for crypto’s market volatility and ensure that any risk-weighted reserves comprised of crypto do not compromise underwriting standards.
Under the directive, both enterprises must submit their assessment proposals to the boards of directors for approval and then to the FHFA for final review.
Fannie Mae and Freddie Mac were put under government control in September 2008 as entities that are known as government-sponsored enterprises, or GSEs.
Arevon Energy just brought a massive new battery storage project online in San Diego’s Barrio Logan neighborhood, and it’s built to keep the lights on when the grid gets stressed.
The new Peregrine Energy Storage Project clocks in at 200 megawatts (MW)/400 megawatt-hours (MWh), making it one of the biggest battery storage facilities in the San Diego region. That’s enough stored energy to power around 200,000 homes for two hours during peak demand.
Built for $300 million, Peregrine is the fifth utility-scale energy storage project Arevon has launched in California. It uses lithium iron phosphate (LFP) batteries, which are known for their safety and thermal stability. LFP batteries use iron, phosphate, and lithium to create a strong chemical bond that resists overheating, making them safer than other lithium-ion chemistries. They also have a longer lifespan and are less prone to degradation over time.
The facility created more than 90 construction jobs and is expected to generate over $28 million in property tax revenue over its lifetime.
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Energy storage projects like this are key to making California’s grid more stable and reliable. By soaking up clean energy when demand is low and discharging it when the grid is under strain, Peregrine helps reduce blackouts and avoid spikes in electricity prices.
“The successful completion of Peregrine Energy Storage is a result of the collaborative efforts of the project’s stakeholders and the local community who collectively support California’s renewable energy goals,” said Kevin Smith, CEO of Arevon.
Arevon already operates more than 3.2 gigawatts (GW) of renewable energy projects in California, with another 800 MW under construction. Nationwide, it owns and operates 4.7 GW of solar and storage projects across 17 states.
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The time is finally here: there are actual driverless Tesla Robotaxis on the road, at least in a portion of Austin, Texas, as of this weekend. And thanks to their ridership of exclusively Tesla influencers, almost all of the miles they’ve put under their belt has been filmed or livestreamed, which gives us plenty of footage to discover what’s gone right and what’s gone wrong.
Tesla’s Robotaxi service went live on Sunday around noon, at least for the relatively small number of Tesla influencers who were invited to ride.
It’s a limited launch in several other ways, too – it’s geofenced to somewhere around 30 square miles in South Austin which Tesla spent additional time mapping and testing in, it’s supported by backup teleoperation, it doesn’t operate from 12am-6am or in bad weather, and every car has a “safety monitor” in the passenger seat with access to controls to stop the vehicle.
Because of that decade of promises, a lot of eyes have been on this launch – and also because of the fact that every invited rider is chasing views on social media, so we have a lot of footage just a few days in.
To be clear, this is not the first driverless taxi on the road. GM used to operate robotaxis through subsidiary Cruise (more on that in the Take), and Google has its Waymo robotaxis in multiple US cities (it just expanded its service area last week) and is even testing overseas.
But, Tesla is Tesla, and there’s always more attention on what Tesla does. So lets put a little more attention on the various errors that we’ve seen from Robotaxis in the 3 days since launch.
But, soon, errors started creeping in. We added some as updates to that article as they came in, but we thought this article would be better to compile them all (and thanks to r/SelfDrivingCars which compiled several others)
Indecision leads to driving into an oncoming lane
In Tesla Daily’s first Robotaxi ride, the Tesla tries to attempt a left turn one intersection early, gets indecisive, then continues on, driving through an oncoming lane for a time before re-entering a left turn lane ahead. See the whole exchange starting at around 7:08 in this video:
Robotaxi stops in middle of street for about a minute
Dirty Tesla pressed the “pull over” button to get dropped off early, and the car got confused and tried to let him out in the middle of a left turn lane. Support ended up “resuming the ride” and the Robotaxi found a nearby gas station to drop him off at. The whole interaction took about a minute, starting at ~8:58 in the video:
Robotaxi drops rider off in an intersection, stays there for ~55 seconds
Farzad also asked for a slightly early dropoff, and the car stopped quite early… as in, gridlocked in an intersection and leaking out into one lane of traffic. Thanks to wide Texas streets for letting others by, I guess. 38:04 in the video:
Tesla phantom brakes when caught by sun glare
Kim Java had a hard “phantom braking” moment, where the vehicle hits the brakes for no particular reason, while driving into the setting sun. 10:13 in the video:
Safety monitor intervenes, presses “stop in lane” to avoid UPS truck
In what seems to be the first true intervention caught on video, Dave Lee was approaching a parking spot when a UPS truck stopped in the lane and started backing up. The Tesla “safety monitor” in the front seat wisely anticipated the situation and was hovering the “stop in lane” button, then pressed it when it seemed like the car wouldn’t stop on its own. The car then remained in position while the UPS truck backed up, giving it just enough room, but it probably would have been nicer if it backed up a little more. Excellent job by the safety monitor here, really. 28:53 in the video:
The previous day, Dave Lee was getting picked up by a Robotaxi in a parking lot and it hit a curb in the parking lot right at the start of the drive (at 0:39 in the video).
Robotaxi hits a bump too fast, then goes 27 in a 15mph zone
Farzad was heading to a disc golf course on a low-speed street. The Robotaxi handled one speed bump well, but then took another one too fast. It then drove past a 15mph speed limit sign, slowed down for a deer, and then picked speed back up to 27mph. The whole exchange starts around 14:27:
In the same video, starting at 4:56, the car seems not to know what to do about a shopping bag in the road – it brakes, then considers going around it, then just runs it over.
Tesla brakes for nearby police, exterior view
Edward Niedermeyer, a longtime Tesla hater, posted a video from an exterior angle of a Robotaxi behaving strangely nearby police vehicles. The Robotaxi passes by one police vehicle with lights on in a parking lot, then brakes rather hard when it passes by another police car blocking a side intersection, then passes by another at normal speed, then brakes hard for a fourth despite it being in a parking lot behind a curb. Slowing down would be appropriate behavior in this instance, but the braking events seem more sudden than necessary, and inconsistent given the position of the police vehicles involved.
Safety monitor intervenes, hops in drivers seat in parking lot
In what seems to be the second intervention, Dirty Tesla had just gotten out of the taxi and while it was trying to leave the parking lot, it nearly ran into a parked car. The Safety monitor intervened to stop the car, then apparently got out and drove the car away manually (not captured in video).
Super tight squeeze for robotaxi in one of my last drives 🫢
The owner of the parked car asked if it was my car and I told him it was a robotaxi. The robotaxi backed up and then the driver of the parked car left. It looked like the tire touched the parked car. The safety driver… pic.twitter.com/DzNuAQk6Su
Yes, the title is lighthearted. I was going for irony.
The fact is that there are issues with Tesla’s approach to self-driving, and these various videos show them.
Tesla drivers are well acquainted with the current limitations and quirks of FSD as well, many of which were shown off in the clips above. It doesn’t do well with sun glare (neither do you, but you can wear sunglasses and/or flip down the visor for a little help), it sometimes misses speed bumps, it phantom brakes, and it has weird moments of indecision sometimes. C’mon, we’ve all seen it, let’s be honest with ourselves here.
As best I can tell from hundreds of miles away, these vehicles exhibit pretty similar behavior to the FSD in the vehicles I’ve driven. It works pretty well a lot of the time, but most of the time I’m also glad I’m there in the driver’s seat so I can tell it to STOP CHANGING LANES FOR THE 5TH TIME THIS MINUTE FOR PETE’S SAKE.
Tesla’s system also uses only cameras, not LiDAR, and most experts (including Tesla engineers) agree that incorporating multiple sensing modes is the correct path to take (here’s more on that). Tesla is using only cameras because it’s cheaper, and thus more scalable (though LiDAR prices have dropped rapidly).
In particular, LiDAR does better in poor weather than cameras do. We haven’t seen particularly bad weather yet for Robotaxi (there was rain in Austin on the morning of the Robotaxi’s launch – and the launch coincidentally did not happen until afternoon), and Tesla’s FSD system does work in the rain.
But even I, in famously sunny Southern California, have encountered a rainstorm severe enough for FSD to suddenly shut off and tell me to take over. So, in the very conditions that you’d definitely want an enclosed space to keep you safe from the weather, Robotaxi might not work.
So far, the errors we’ve seen above have not caused any sort of damage, either to Tesla occupants or the general public (except for some curb rash, perhaps), but as miles get put on the system, it is inevitable that something will happen.
When something does happen, the public will not respond kindly to it. Recall when GM’s Cruise robotaxi got into an accident in San Francisco – which was actually entirely the fault of a human driver. A human driver struck a pedestrian, who was then pushed into the path of a Cruise vehicle which didn’t have time to stop, and hit the pedestrian as well.
This was largely reported as a self-driving car crash, even though Cruise didn’t cause the accident in the first place. Cruise was, however, responsible for having poor after-crash behavior, as the car didn’t realize the pedestrian was stuck under the vehicle and dragged her on the road for several feet, and then hid this fact from investigators. As a result, its license was pulled in California and it soon shut down elsewhere as well.
We are all aware of how many unpredictable things happen on the road every day, and how many problems are caused by human drivers. Autonomous technology does promise solutions to that, particularly in its theoretical ability to make decisions quickly. But autonomous technology has heretofore not been great at understanding what to do in unexpected situations, like the Cruise issue above.
Waymo has had issues as well, one of which you can see in my own experience with the system, where the car I was in got stuck for several minutes trying and failing to make a left turn into a crowded street. Or this clip where it gets stuck in a parking lot and needs a manual driver.
One pattern I do notice is that a lot of Tesla’s errors seem to happen when the car is dropping off or picking up riders. This could be because parking lots are more complex spaces than roads, or simply because the ability to park is a newer feature for FSD. In my time in Waymos, it also seems the least decisive when trying to find parking or pickup spots.
But the exceptional part about these Tesla issues is that it’s only been three days, and there are reportedly only 10 cars and 20-some riders using the system. Tesla has always said that it could scale its solution to an entire fleet with a single software update, without geofencing, thus turning the entire fleet autonomous overnight.
And Tesla has also always been famous for the “move fast and break things” approach which is so common in Silicon Valley. This is all well and good for tech, but when you’re dealing with thousands of pounds of metal going down the road near pedestrians, things can get serious real quick.
Thankfully, Tesla does seem to be taking a more measured approach than we might have expected, given its inclusion of safety monitors who we’ve already seen avoid two accidents in just the first three days of operation. But that’s not scalable, and while Tesla fans have pointed out that Waymo also started with safety monitors, it didn’t charge fees or take public rides during that testing phase, and Tesla is doing both.
It remains to be seen if Tesla’s approach will be scalable faster than Waymo’s (or MOIA’s, or Zoox, or anyone else’s), but given the first few days of limited operation in Austin, the dream of expanding everywhere overnight does seem unlikely.
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