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undersized furnace

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Is It Better to Oversize or Undersize a Furnace?

January 12, 2026

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Aurora, ON L4G3V6

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Home
Blog
About Us
Offers and Rebates
- Guelph Greener Homes
Cooling Systems
- Air Conditioner
  - Air Conditioner Installation
  - Air Conditioner Repair
Heating Systems
Water Products
- Water Heaters
  - Tankless Water Heaters
  - Tank Water Heater
Energy Products