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Question:

How much does it cost to add AC to a 750 Square Foot house? The house already has a new furnace for heat.?

This house has just been remolded. Has a new furnace and has been plumed for AC

Answer:

It shouldn't cost you much. You can probably get one of the smaller models for a smaller home, and the installation may take a few hours - anyone charging for more than one days worth of work is ripping you off ;-)
Central Air should run around $ 1000. for the evaporator, condenser, thermostat and related connections, refrigerant and labour.
furnace like central heat ? or wall heater ? There should be a plate somewhere usually near the control it should tell what BTUs the unit is Wall heaters now basically start at 35,000 BTU unless you use a vent less which is not allowed by code in the u:S. The central heater now start at 50,000 BTU
You could get a 12kbtu portable unit, install it anywhere in the house, and run the furnace fan for 1/2 hour each hour
You can, of course get central air to hook right into that new furnace. Probably should have just gotten a heat exchanger and it would have provided both heat and AC and would have been perhaps a cheaper way to go. another thing you could consider since the house is so small, would be to add window or wall AC units. I cool my mobile home in FL with wall units. It is cheaper to run and they are cheap. I just bought a 12000 BTU unit for $188 and it has an energy rebate on it. The installation is the more expensive part so if you can install it that is great. One of those might do it, but you could get 2 and put one in living room and one in master bedroom. If you are in a cold climate, you may want to put a cover over them in the winter. In the south, you may use them in part of the winter. Even 8000 BTU should cover a 12 x 12 ft or so room. One I got was a Sharp and i got it from Brands mart (don't know if they are out of FL or not). You could probably get by with a 1 ton unit on central air, not more than 1.5 ton with a house that small. Check several places, including where you got your furnace. Usually there will be a compressor unit outside and a blower unit attached to the furnace itself. Good luck to you. You are going to have to callfor estimates anyway, so why not just make some calls to get estimates and then you would decide on how big a unit you need and your inquiries would be comparing apples to apples.

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