So I decided to take advantage of the single digits and check the house for cold spots.
I grabbed the IR thermometer and found a few.
I noticed a few discolored spots on the ceilings. Yep there must be a gap in the attic insulation. These little spots are 15 degrees cooler than the rest of the ceiling. No I'm not going up to look right now.
I checked the front door. Ouch, the bottom of the door is 35 on the inside. It does not seem to be the door or door gasket itself, but around the door and trim and under the threshold. Looks like I might be pulling off the molding and applying some spray foam.
The bow window in the house is cold also. I guess just because of the size.
The house was built in the mid 70's but all the windows and doors have been replaced in the last 10 years I think. Everything is vinyl double pane stuff.