Why is there window condensation in our new home?

By Blythwood Homes    In New Home

Why is there window condensation in our new home?

There’s a plethora of reasons, but here is the short version:

In modern insulated homes you will inevitably find condensation on windows when outside temperatures drop dramatically. This can be controlled through routine maintenance.

  • In a new super insulated and air tight home you can expect MORE condensation on windows than in an older home. That’s because the walls are super-insulated, and your home is more air tight, but the window glass is still very cold.
  • Given a steady level of humidity inside, the colder it is outside the more condensation you will get on your windows.
  • One solution is to reduce the humidity inside during cold weather. When we get extreme temperatures like minus 15-30 Celsius you can temporarily lower your humidity or even turn your humidifier off.
  • Also, you should turn your ERV/HRV up to run more frequently and longer. This will introduce more cold air but the trade off is worth it to avoid excess condensation.
  • Remember to run your bathroom fans during and 60 minutes after a shower and use your kitchen fan when cooking.
  • My preference is to wipe off any condensation each morning and then open the drapes or shutters to allow the air to circulate against the windows and dry them off. It is important to open drapes or shutters or you may be starting your own little mold farm!
  • Remember that condensation on your windows is a sign that your home is air tight and very well insulated. The solution is to adjust the settings of your humidifier and ERV/HRV and check the windows each morning for moisture and wipe them off if needed.

I hope these pointers will assist you in managing your humidity.

Best regards,

Rob Mills
Blythwood Homes