Taking bids on new A/C and spray foam insulation

[swamp snorkler]

Research how much tonnage you need on your AC if you go with the spray foam. From what I understand you have to undersize your unit to make it run more. Help to remove the humidity.

[fishinpox]

Originally Posted by swamp snorkler

research how much tonnage you need on your ac if you go with the spray foam. From what i understand you have to undersize your unit to make it run more. Help to remove the humidity.

true to c certian extent.... Now a days hvac companies are overtonning every new house so theydont get call backs .. Problem is that causes system/ ducts to sweat badly , so by under tonning it all you will do is have a warm house . What you need to do is under ton it and use a variable speed 2 stage system so you can either slow the fan down or speed it up depending on humidity levels. In our new house i under ton it , upgraded to a 16 seer variable speed system . After we move in i have a engineer that will come tweak the system and fans so we cab get around 27-31% humidity . Temp is not what make syou uncomfortable in a house it is the humidity . Currently to stay semi comfortable st my house im living in we set it at 67* which is cold but if we go higher it gets muddy and warm . So with our new system the plan is to stay around 70-72* but only be 27-31% humidity.