Solution for frigid condo

Floor insulation to the rescue

Q: My single-level, end-unit condominium, built in the early 1980s, is always cold, despite the fact that the outside walls are insulated and the windows are double-glazed.

I have a gas furnace in the attached garage. The crawl space is lined with heavy-duty vinyl, and the amount of head space is about 2 feet. There are a lot of pipes and wires. I wonder if it would help to add some kind of insulation under the flooring. How would you recommend doing it, and do you feel it would be cost-effective?