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Message: [QUOTE="bfs3, post: 4814766, member: 10189"] So the tricky thing about answering that question isn’t the size but the layout. One unit can create 36k BTUs or 4 can. It depends how open the space is and if you’re want to close bedroom doors. If you have 3/4 bedrooms upstairs and your downstairs is pretty open then your best bet is a ducted heat pump upstairs and a second mini split downstairs on the opposite side. Just remember for every indoor unit they need to run copper pipes to connect to that outdoor unit. If you’re ok with how that looks then you count one for each bedroom/room that closes with a door and downstairs atleast 2. One on opposite sides. If the basement is open you can get away with one 12K unit. Using rule of thumb, you’ll need 70-100K BTUs to heat 3800 sq feet. If part of that is your basement then it’s on the lower side. Of course lots of variables can change that number. Age, insulation values, windows and orientation of the home. I would recommend getting a quote on a Mitsubishi ducted system. A 36K Condenser (or larger if a 42/ or 48k is available). They can replace your upstairs air handler with Mitsubishis 24/30K air handler and install a 12K mini split downstairs on the same super efficient condenser. Then you set your boilers thermostat to 65 and if kicks on you know it’s time to shut off the heat pump. This would be super efficient and your AC would be top of line and dehumidify. If that doesn’t work for your budget or the house layout I would get a quote on a Bosch ducted heat pump to replace your upstairs AC and another single zone for downstairs. An 18K is only a few hundred more than a 12K for a single zone. These will both be rebate eligible and meet any special financing offers Energize CT is offering. You don’t eliminate the boiler but you won’t be using it much at all. I prefer the Bosch because it’s heavy duty and costs about $5-8K less than a Lennox or Carrier at the same efficiency. [/QUOTE]

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