Where are these cold air returns pulling air from?? The far end of the house? or from a central hallway?
Cold air returns are only pulling from only two places right now. The first one as you can see is nearly right above the stove, in a downstairs bedroom that has a door open at all times. The second cold air return is in the kitchen. The kitchen is a bad place for a return(but it was already there), everything I’ve read said not to put a cold air return in the kitchen or the bathroom. There are times you never want to recirculate air from either one. I know everyone would benefit from a floorplan, but I don’t have one drawn up.
This is not enough for me, and I need to add two more in order to have one in each room on the first floor. I plan on changing one existing hot air register to cold air, because its on an inside wall. I will then putting in new hot air near the outside wall. I need to run a second main trunk to make this all happen, and just can’t find the time.
I see two hot air outlet ducts and now two cold air returns. Could you describe the general air flow you have now?
As you can see from the picture on this post, I actually have two 8 inch 420 cfm fans tied into the plenum on my gas furnace, and then going down my main 8x14 trunk(not just two ducts). Generally I have a very even temperature in all my rooms. I took advise to buy $1 thermometers for each room and its all balanced with everything wideopen and not dampered. Personally I can’t feel much of a difference from before and after the cold air returns, but I know its helping. I think I’m burning less overall to keep the same temperatures as before. I measured the temperatures coming off the return and always get temperatures in the high 60s… where my basement floor was more in the mid 50s.
How much has the temperature in the basement dropped now that you aren't using the basement as a huge uninsulated cold air duct?
I think the basement temperatures have gone up a little, but I really haven’t noticed it until you said something. I wish I would have kept an eye on them closer. The main reason behind the cold air return is to put a filter in place. The bad things in the ash dust has me nervous and I don’t want to aggravate my sons asthma by trying to save a few bucks.