I have a one floor 1400 sq ft bungalow with a finished full basement.
I wish to install a/c The home has a forced air oil furnace.
The basement is VERY cool , even when there is a heat wave. The main floor can be 78 F and the basement will be a cool 64 F.
In a heat wave,I normally will run the furnace fan on continuous low speed (sometimes with fan door off(with a filter) and this will circulate the nice cool air up to the main level and helps to lower the temp on the main level,thus bringing the lower level up.
But if the heat wave is constant for more than 2 or 3 days this upper level gets a lot warmer.
My question is; If a/c is installed won't this make the basement even colder?, unless of course I shut the basement registers off in the cooling season. I know in order to 'normally' cool 2 levels I will need a 2 ton unit, but by just only cooling the upper level would I just install a 1 ton unit. I don't want a 60 F basement. . Is a Zone system an option? Thanks for any input.