Window condensation and musty air
Water pooling on window sills, fogged glass, musty smells, maybe mould spots in corners or closets.
What it usually means
- Too much indoor humidity for the ventilation you have — common in tighter 1980s+ homes without an HRV
- Cold surfaces (single-pane windows, uninsulated wall corners) hitting dew point
- Bathroom/kitchen fans that vent nowhere or never get used
What an audit measures
- The audit checks ventilation rates against occupancy and airtightness — the actual ratio that causes condensation
- Thermal imaging finds the cold spots where mould starts
Try first (cheap or free)
- Run bath fans 30 minutes after showers; verify they vent outside
- Keep winter humidity near 30–40% (a $15 hygrometer tells you)
- Don't buy windows to fix a ventilation problem
The fix ladder
- Fix/duct existing exhaust fans
- Add an HRV
- Insulate the cold surfaces (walls/corners) if imaging shows them
Rebates that apply
- HRSP (with assessment) — Get $600 back on your energy assessments — then up to $7,700 for insulation
Want it diagnosed properly?
A registered energy advisor measures instead of guessing — blower door, thermal imaging, and a written upgrade report priced against rebates.
Email us what you’re planning and your postal code — we’ll reply with registered service organizations for your area and which rebates apply.
Email hello@audityourhome.com