Insulation is probably the most important mechanical energy saving feature of a house. Unfortunately it is behind the drywall and as they say "out of sight and

Insulation is probably the most important mechanical energy saving feature of a house. Unfortunately it is behind the drywall and as they say "out of sight and out of mind". We built a very large cottage (3000 sq/ft) in Northern Ontario, Canada. The entire house had a continuous envelope of a minimum of 4-5 inches of Closed Cell Foam (2 lb) ( https://www.demilec.com/ https://www.demilec.com/ ) . Installed a Geo-Thermal Unit with in floor heating through out the basement and forced air everywhere else. We also have a high efficiency fireplace stove. It can be minus 40 C outside and you only need a couple of logs in the fireplace to keep the entire cottage very warm. You can change out your furnace/AC/Heat Pump anytime, but try tearing off all the drywall in your entire house to replace the fiberglass insulation that doesn't work or was installed incorrectly. Spray Foam Insulation pays for itself and to think it's only around $3.00 a sq/ft at 3 " thick installed. People have no problem paying more for carpeting or tile floors, strange....