Pioneer Air Conditioner WYS012A-20 Wall Mount Ductless Inverter+ Mini Split Heat Pump, 12000 BTU-110/120V

Update! I had a small problem and contacted Highseer. The support was beyond my expectations! It’s rare to still find this level of support...very impressive! These people are top notch! I purchased a 2 ton 24000 BTU unit to replace a Sanyo of the same size that had died. Installation was straight forward and went without a hitch. The most difficult part was bending the copper tubing. If I had it to do over again, I'd buy a tubing bender. Operation is whisper quiet and it cools my whole house. The only nit I have to pick is the temperature isn't quite as steady as I'd prefer. I'll set it at 74 and the remote shows 71 but it's still cranking out cold air. At other times with the same 74 setting, the room and temperature display on the remote will show 77 and it's not kicking up the cooling to compensate. Although this annoyance is the only reason I can't give it 5 stars, the unit still does a decent job. Update: After going through a winter and using this unit to supplement my heating, I’m increasing my rating to 5 stars. My home has electric baseboard heat which is a terrible power hog. As such, my primary heat has become a wood stove which does a splendid job of heating my entire home even in sub zero temperatures. Where the wood stove fails is those days and nights with temperatures in the 40’s. It’s not cold enough to build a really hot fire and a low slow burning fire is difficult to keep going. It also causes creosote build up in the chimney. Well in those temperatures is where the heating abilities of this mini split system is right at home! I produce my own power with solar panels and these moderate spring and fall temperatures is where I was forced to use the electric baseboard heat. That killed my power budget for the year and resulted in having to buy power from the grid. The efficiency of the heat pump has allowed me to go a complete year with a power surplus for the first time! You heard right... the power company owes me money!!

I'm giving this 5 stars because it has been amazing, but I want to point out one issue first. The tubing for the gas lines did not seal properly out of the box and I had to re-flare the ends. If you can afford it, I suggest getting a professional to help install this for you (this may prove difficult because a lot of heating and air companies do not want to install a device they didn't sell you. With that out of the way, otherwise this thing has been wonderful. I installed this to heat an upstairs attic/bedroom that is about 650 sq ft. In the summer it can get over 100 degrees up there. This cooled it down to 70 within a half hour. It's insanely quiet, even in heating mode. It looks very nice. It kept my family warm when our furnace died a week ago and it got to below 30 outside at night. We all just slept in the room with it and were perfectly comfortable. Installation was pretty simple if you have the skill to do it. The instructions were well written and thorough. Excellent product. The best part, it reduced our electric usage 41% just in the first week of using it because it was actually cooling the downstairs a bit as well and keeping the normal AC from running. So far in the cold weather our utility bills are down about 20% over last year using this.

I hate people telling me what I can't do. I want to live in a society that is always trying to help others do everything, from medical help to "holier than thou" HVAC work. Programmers have put open source software into everything like TVs, refrigerators, thermostats, electrical grids, airplanes, and everything else digital. Why can all other professions have the same sharing attitude? I decided to install this myself in a small, 720 square foot decently well insulated home. This was my first time ever working with HVAC and so far it seems to have worked great. It cools off beautifully. The first thing I have to say is that the instructions are written very well. The only part that seemed understated was the head unit wiring. It's not hard but I didn't find the instructions clear on my particular model. I had trouble pumping a vacuum during my "tests" before install. I didn't even come close to tightening the copper properly. The instructions warned several times about "over tightening". I waaay under tightened. With the proper torch with a torch wrench, I had no problems. I pulled a vacuum, waited for a half hour, and filled the system with refrigerate as directed by the instructions. It worked great. Running the copper lines is the most difficult and nervous part. I was very careful, and I recommend two people help with this. The instructions are great. But there are a few things that caught me by surprise: - The indoor unit just clings onto the bracket. If feels strange, but it looks great. - The drain line seems a little short still. - It came with a small bag of "plastic" something and I have no idea what that is for. The instruction made no mention. My local discount tool place sells torch wrenches for $20 and crow foot wrench heads. You need a large head ( I believe 1") for the large line. The only place I can find that sells those is Amazon. Search for Crowfoot Wrench Set. Should run about $20. ***You need this!*** Since the heat pump mode operates at a high pressure, it's very important that it's properly tightened. - AC Refrigeration Pump (can be bought on Amazon for about $130) - Mini Split adapter fitting. (the pump is usually a different size then minisplit) ($15) -Torch Wrench ($20) -Crow Foot Wrench Set ($20) *You need this* - HVAC flaring Kit ($35) - Hole Saw ($20) - Pipe cutter (for copper) ($10) - Condenser bracket/Mounting bracket or pad ($45) - Line cover kit ($45) - Electrical AC disconnect ($10) - Electrical wire - Pipe sealant suitable for HVAC lines. ($8) So your'e looking at around $350 if you were to buy all the extra tools and parts yourself. The electrical, with a shutoff by the unit costs about $30 for all the parts and wiring. I've been running it on "eco" mode and it keeps the place cool on 100 degree days. I can easily get the house down to 67 if I crank the system on high. And that's it! I'm happy so far, seems very well engineered.