I have an old rental property in Statesville NC.
I plan to put in central heat/AC. Trying to decide between propane
gas pack and heat pump. The contractor recommended adding insulation
and replacement windows.
I plan to get blow in insulation in enclosed walls. Have a bid for
And battings and blow in for accessible attic areas.
The real question is windows. I could put in replacement windows at
about $214 per window installed. But I don't see them paying off.
The U factor is .37.
But the U. factor for a storm window over and old window is .6
according to this site:
I might get by replacing all or part of the storm windows. I am not
sure how much a storm window will cost, its been hard to find pricing
on the web.
I did some calculations and I just cannot see a replacement window
saving more than $10 to $15 per year based on those U-factors.
Probably less since I assumed a 50 degree F differential
for 180 days per year which seems a bit high and I used $20 per
million BTU of heating/cooling cost and 12 square foot window.
214 per window, vs unknown storm window cost and installation time.
The rental is about 3 hours drive so I do have to go to some trouble
to travel down and install storm windows.
It will cost around $4000 if I go with replacment windows.