Forums DIY House insulation improvements? Reply To: House insulation improvements? May 9, 2018 at 9:55 am #197 amber 5 Posts These things all depend on what you have already. Underfloor insulation is good ie. carpets and underlay but I wouldn’t go tearing up and replacing anything that isn’t due replacement. I have been surprised how much better my modern double glazing is relative to the older (15 ish years old) units. On a cold night I get serious condensation on the older units but on the new units in the kitchen there’s nothing at all.