3 posts / 0 new
Last post
cashin
HVAC for Basement

I'm looking to renovate my basement, and I've gotten mixed recommendations from HVAC specialist. I currently have 2 zones, 1 for the first floor and 1 for the second floor. The first floor is about 1,200sf. The basement space we're converting is about 800sf and will be entirely open. The one for the 1st floor is a 3 ton ac unit and 75,000btu furnace. I would like to ideally not have to add another zone for the basement as it seems a bit much. One person told me that they thought the unit could handle the entire space because the basement should be considered to heat and cool only half the amount I was actually trying to heat. I'm trying to come to a conclusion as to what we should ultimately do. Any suggestions and experiences would be appreciated. Thanks.

canuk
Re: HVAC for Basement

For the space you decribed we commonly would use 2 - 3 six inch supplies and one 5-6 inch return --- depending on what the space will be used for. This could also be zoned seperately from the first floor if desired.

Of course how well insulated the perimeter walls are will also determine confort.

Bob Gabrilson
Re: HVAC for Basement
cashin wrote:

I'm looking to renovate my basement, and I've gotten mixed recommendations from HVAC specialist. I currently have 2 zones, 1 for the first floor and 1 for the second floor. The first floor is about 1,200sf. The basement space we're converting is about 800sf and will be entirely open. The one for the 1st floor is a 3 ton ac unit and 75,000btu furnace. I would like to ideally not have to add another zone for the basement as it seems a bit much. One person told me that they thought the unit could handle the entire space because the basement should be considered to heat and cool only half the amount I was actually trying to heat. I'm trying to come to a conclusion as to what we should ultimately do. Any suggestions and experiences would be appreciated. Thanks.

Your current furnace and A/C is large enough. I would, if possible, run a seperate supply line for the basement with a volume damper so that it will be easy to shut off the during the summer. If you don't zone, make sure that you don't skimp on the amount of supplies and returns.

TV Listings

Find TV listings for This Old House and Ask This Old House in your area.