1. to make sure all crawl space vents are close .
2. you can check all exterior doors and windows do not have air leak .
3. check attick insulation should be minimum 10'' or you can add more insulatio ... read more
The above are two good, and siilar in approach answers, but there are two issues it seems no one includes:
1) If you house was built before 1978 it must be inspected by a certified contractor or lead ... read more