Why does my home feel colder after renovations?

Your home likely feels colder after renovations due to disrupted insulation, air leaks from new openings, or changes to your HVAC system's airflow patterns. This is actually a common issue that many Toronto homeowners experience, but it's usually fixable once you identify the root cause.

The most frequent culprit is compromised building envelope integrity during the renovation process. When contractors open walls, ceilings, or floors, existing insulation can get damaged, compressed, or removed entirely. Even if new insulation was installed, gaps around electrical boxes, plumbing penetrations, or framing joints can create thermal bridges that allow cold air infiltration. In Toronto's climate, where we regularly see temperatures below -10°C, even small air leaks can make rooms feel noticeably colder.

HVAC system disruption is another major factor. Renovations often require disconnecting or rerouting ductwork, and if the system wasn't properly rebalanced afterward, some rooms may receive insufficient heated air. This is particularly common in older Toronto homes where the original heating system was already working at capacity. Additionally, if your renovation added square footage or opened up spaces (like removing walls), your existing furnace may now be undersized for the increased heating load.

Changes in air circulation patterns can also affect comfort levels. Opening up floor plans or adding new windows can alter how air moves through your home, creating cold drafts or dead zones where warm air doesn't circulate effectively. Toronto's winter winds, especially in exposed areas like the waterfront or Scarborough Bluffs, can exacerbate these issues.

Immediate steps to diagnose the problem include checking all renovated areas for visible gaps around windows, doors, electrical outlets, and baseboards. Use your hand to feel for air movement on cold days, or hire a professional for a blower door test (typically $300-500 in the GTA). Have your HVAC contractor verify that all ductwork connections are secure and that dampers are properly adjusted.

For professional assessment, consider having an energy audit performed by a certified energy advisor (often subsidized through Enbridge rebate programs). If the issue is significant, you may need insulation upgrades, air sealing, or HVAC modifications to restore comfort levels. Don't ignore this issue - poor thermal performance not only affects comfort but increases your heating costs throughout Toronto's long winter season.