Tell me about your experiences with your heat pump

This is the key factor. If you’re talking through the wall and your place gets below 20 degrees then you need to make sure it has a secondary heat source. Electric most likely if it’s a through the wall style.

I personally would prefer an outdoor AC with an indoor Air handler that could have propane or natural gas assist.

Outside of all that, I think heat pumps are well worth it.


Just read the thread lol. A bit late on input but I hope you like it. I think they’re worth it


@BrianK. Your not gonna hear the mini split outdoor unit running unless you pretty much go outside and try to listen for it. Sooo much quieter than a conventional split system. Though a lot of the new outdoor units today are coming with variable speed compressors and fan motors which make them much quieter as well. But the minis have always been quiet as long as I’ve known about the mini.


It was already stated. Heat pumps don’t work. They are an air conditioning unit. And A/C removes the heat. The system is just working in reverse, and it is cold outside. What heat are you removing from the outside when it is freezing cold out? When it is 45 and there is a chill? Sure.


Yes, very quiet Machgunner. The only time I can hear the outside unit is when I put it in “powerful” mode. Then I can hear the hum of the compressor through the wall that it’s mounted on. Outside I only hear air movement. So far we really like it alot but have only used the a/c and the dry modes extensively. I’ll know more this winter. But I intend to fill our oil tank as the back up to our backups, and the wood racks because we really like wood heat, and the visible fire, when it gets really cold, below 20°F and if it stays there for awhile. Wood heat isn’t something entered into for just a few hours, or at least I don’t. When I light the wood stove I intend to use it for days or longer.

Nick, it’s too late for horror stories. The heat pumps are installed for better or worse. I’ll find out for myself what’s what in the cold weather in 4 more months. But as mentioned above they aren’t our only source of heat. Everything we used for decades is still in place and working fine. But Efficiency Maine gives them their seal of approval for our winter and paid us to have them installed to save us $ and energy. It’s said that they get inefficient at -5°F but are usable down to -20. But our plan is to not use the heat pumps before that temp’ is reached. But again, I intend to find out since we already have them. FWIW, in theory there is heat available until one reaches 0°Kelvin (-273C). The trick is to collect it for use. That technology we don’t have in a heating unit. :smiley:

Frankly heat pumps are beyond my understanding and at some point I need to trust the folks who know more than I do. Which is what we did.

I’ll revisit this after we start to get our electric bills, next month will be the first, and after I have some winter experience. But the fans appear to be low draw and the heat exchanger outside has an incredibly fine and complex fin network to maximize efficiency from the air movement that is induced by the fan.

Machgunner, question for you… should I hose out the fins once in awhile to remove dust and such for good heat transfer? Or is it hands off?


@BrianK yeah man. I would 2 times a year if I were you. Once in the spring. Another in the fall. Just water only and don’t use any kind of pressure. If your comfortable with it. Take the cover off and get to the I side where you can get the hose on the inside of the coil and let the water run through the fins from inside out. Don’t use a sprayer or anything like that. Just use the open hose. You don’t have to do all that. But yeah. Can never hurt to hose those fins off. Especially if you do that consistently. Hopefully it should never get gunked up bad enough to ever need a “professional “ cleaning. Most people never even think about doing something like that. They just call a service company complaining the unit isn’t working and the company goes out to find the condenser is dirty from 10 years of someone cutting grass and blowing the dirt and grass clippings directly into the ac unit while the fan is running which in turn sucks in all that dirt and grass like a vacuum. Lol. Minis aren’t near as bad though. Their fans don’t run anywhere near as fast as a conventional unit. Just spray it off twice a year. You’ll be good to go.


We had our first “problem” with both heat pumps yesterday. It turns out that it was an education problem. We had a power outage and got mega error messages from the blinking lights on both units after the power came back on.

I tried what I could to reset them but nothing worked. I went online to get the CS center, but their 24/7 service was closed for the weekend. (In whose mind is a 24/7 service center ever closed?) And due to the holiday I didn’t even bother to call our installer.

Thankfully it was cool enough so that we could live with not having them running. I’d been running them in “dry” mode just to dehumidify.

So we were without them over the night and for all the waking hours I wondered where the reset was on the units but I wasn’t going to open anything up to peer inside. If it was in the manual I missed it. It turns out that I was on the right track when I flipped the breakers off. I just didn’t wait long enough. The woman I talked to at the local installer suggested I go out to the tiny fuse box next to each unit and pull the fuses. After waiting a few minutes I put them back in and they work fine now. Next time I try flipping the breakers inside to see if that works, but the voice over the phone told me that pulling the fuses has never failed. I don’t see the attraction of going outside at zero dark 30 in mid February when we have 3’ of snow and ice to dig through to get to them though. Indoor breakers are much easier to access.

I inquired and was told that it’s a defense mechanism that’s built into the units that prevents damage. OK, now I know. If they’re running during a power outage they protect themselves from a power surge by shutting down and requiring a reset. I think I’ll just shut off the breakers to them until the power comes back on next time. And it will happen again where we live.




Still loving them. The neighbor stopped by to ask how we liked them. What’s not to like? So far only mostly A/C use and that is wonderful. Of course the wood stove is heat and not A/C, but I compare it to that. Wood heat is constant with no constant up and down. The A/C from the heat pump is the same. No up and down, just constant comfort. We keep it set to 76° and it’s just nicely comfortable. No noise at all. Unless you walk past the air stream and put your hand up into it you don’t even know it’s running. Outside the same thing. Just quiet, but test the air from the outside part (condenser?) and it can be felt and the water coming out of the drain pipe (from the inside unit) can be seen.

We did have a day or 2 where we needed heat for the entire time. Set to 72° it worked exactly the same way as the woodstove, just not with snow blowing and below 20°. Constant and unnoticeable warmth inside, and the unit outside was discharging colder air. But it wasn’t a real test of the heating system. I checked the outputs of the units and the bigger of the 2 has a BTU heat rating of almost 19k. Cooling is 14k. The smaller unit for the bedroom has a cooling BTU rate of 9k and I can’t remember the heating BTUs, but it’s higher than the cooling, similar increase as with the larger unit. Why so small? Our home is small.

I’m almost looking forward to one day of winter to test the units in that mode and in real cold.

In a few days we’ll get our first electric bill from a meter reading. Very interested in that.

Still haven’t seen anyone to give us our rebate check yet, that will take time.


So we had a very uncomfortable summer and the heat pump in A/C mode worked like a champ. Unlike window rattler units it was quiet and just there, but unnoticeable except for the constant comfort.

I haven’t really taxed it yet with extreme cold but last night it got down to 35°F and frost was on the roofs. I left the HP on but set to 64° for the night. When I got up at 0600 it was 68° in our home. I put the temp up to 72 and typical for the unit(s) it did what it was supposed to do without drawing lots of attention to itself. From “off” it appears to take longer than the oil heat to start to heat things up. That’s a consideration now, but when its cold 24/7 they will be on all the time and that lag should disappear. But lighting the wood stove, which is what we use when it get really cold, can take much longer to start putting out usable heat. Each system has it’s characteristics.

In years past I would back myself up to a hot air register that come out of the floor, and let the forced hot air inflate my untucked shirt for instant warming. Those days are over at least when using the HP, like this morning. But I can stand in front of the discharge from the HP and that’s warm. The wood stove I can back up to and get warm with the radiant heat. Just back away or turn around to the other side before the clothes burst into flames.

edit: So far we’re liking the units alot.