We replaced all our windows and added R-50 insulation - our energy bills dropped by about 35% the first winter?

That's an excellent result - a 35% reduction in energy bills after window replacement and R-50 insulation is on the higher end of what we typically see in Calgary, indicating your home likely had significant energy losses before the upgrades.

Your results make perfect sense given Calgary's extreme climate conditions. With winter temperatures regularly hitting -30°C and those notorious chinook temperature swings that can change 20-30°C in a single day, your old windows and insufficient insulation were likely working overtime just to maintain indoor comfort. The combination of new windows and R-50 insulation creates a much more effective thermal envelope that dramatically reduces heat loss.

R-50 insulation is excellent for Calgary's climate - this typically translates to about 14-16 inches of blown-in cellulose or fiberglass in your attic, or equivalent rigid foam board insulation. The Alberta Building Code requires minimum R-40 for ceiling insulation in our climate zone, so you've exceeded code requirements, which pays dividends in our harsh winters. Combined with new windows (likely triple-pane with low-E coatings and argon fill), you've addressed the two biggest sources of heat loss in most Calgary homes.

Your 35% savings suggests your previous windows were likely original single or double-pane units, possibly from the 1970s-1980s era when many Calgary subdivisions were built. These older windows, combined with inadequate attic insulation (many homes from that era had only R-20 to R-30), created significant thermal bridging and air leakage. The freeze-thaw cycling from chinooks is particularly hard on window seals, making older windows even less efficient over time.

From a financial perspective, your upgrades likely qualified for the Canada Greener Homes Grant, which provides up to $5,000 for eligible energy efficiency improvements including windows and insulation. If you haven't already claimed this, you may still be eligible if you had the required EnerGuide evaluations done before and after the work. Check nrcan.gc.ca for current program details.

Your experience demonstrates why these upgrades are so valuable in Calgary - while the upfront investment is significant (typically $15,000-$40,000 for whole-home window replacement plus $3,000-$8,000 for attic insulation upgrade), the energy savings compound year after year. With natural gas prices and electricity rates, many homeowners see payback periods of 8-12 years, and the comfort improvement is immediate.

Consider having a blower door test done to identify any remaining air leakage points - with your major upgrades complete, sealing smaller gaps around electrical outlets, baseboards, and penetrations could squeeze out additional savings.

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