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Bruno71 03-31-2011 08:18 PM

Need some advice please. We are looking to finish about half of my basement and trying to make sure contractor doesn't put to big of a unit in and break my wallet. I live in a ranch and the basement is completely underground. There is one door, window and small boat door on the far side of where I am finishing. So three of the walls are buried deep into the ground. My main floor is 2,200 sq ft approximately and has 13 windows and 5 doors and runs of a 4 ton unit and is very comfortable. My question is would I need a 4 ton unit in the basement considering no windows and underground? The house is located just outside Atlanta area and the basement is usually comfortable and won't run much. It will be used more to keep the dampness down. Looking forward to the feedback Bruno

beenthere 04-01-2011 04:53 AM

Basements take very little to heat or cool them. And you won't find a regular ducted system made small enough for your basement. A mini split may be your best option. And you will need a dehumidifier also.

twinbelle 04-01-2011 05:25 AM

the best way to know for sure is to have you contractor do a heat gain and loss on your basement.

Do not tap off existing system if you have one unless you use zone dampers.

Install a ductless heat pump system.
This will work for heating cooling and will dehumidifie the basement if sized properly.

COLDIRON 04-01-2011 06:01 AM

Agree with been Mini splits are the way to go in basement rooms. Since I installed mine I love it, quite, fast acting, remote stat. Holds set point great.

Tdad 04-01-2011 04:40 PM

1) Do an energy audit to check air leaks, otherwise any money invested in HVAC can be wasted. Some local government or utility company provide incentive/rebate for doing audit

2) Call some contractors to do the heat load calculations

3) Check whether the quoted price is reasonable compared with other consumers' spending

Bruno71 04-02-2011 07:07 PM

Thanks for all the replies. It is very helpful. My quote was for a 4 ton unit, 13 seer and was about $6500. This included duct work in the entire basement, a split unit, condensation pump and everything else needed for a complete installation. I just feel the 4 ton is a bit much, because of the basement being completely underground and 4 ton is what i have on the main floor with all the windows and doors.what I have on the main floor. The contractor keeps saying, because of the sq ft of the entire basement a 4 ton unit will be most efficient. I guess it's time to get another quote. Thanks again, this is a cool forum.

beenthere 04-02-2011 07:11 PM

Yep. You need to keep looking for a contractor

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