Proper sizing matters in both directions. An undersized system runs continuously
and still fails to cool adequately during peak heat. An oversized system
short-cycles, switching on and off too quickly, which wastes energy, wears out
components faster, and fails to remove humidity from indoor air. Dehumidification
is a key function of air conditioning, and a short-cycling unit skips it.
We perform a Manual J load calculation for every installation. The calculation
accounts for square footage, insulation levels, window count and orientation,
ceiling height, occupancy, and heat-generating appliances. It produces a specific
cooling capacity number, not a rough estimate based on square footage alone.
Timmins summers are short but humid, and the calculation accounts for that.
As a rough guideline, homes in the 800 to 1,200 sq ft range typically need
1.5 to 2 tons of cooling. Homes
from 1,200 to 1,800 sq ft usually need
2.5 to 3 tons, and larger homes
typically need 3.5 to 5 tons.
These are guidelines only. A proper load calculation is the only reliable way to
land on the right number.
SEER, or Seasonal Energy Efficiency Ratio, measures how efficiently an AC system
uses electricity. The Canadian minimum is 14 SEER. High-efficiency models reach
18 to 20 SEER and above. Every point of SEER improvement reduces cooling costs by
roughly 5 to 7 percent per season, which adds up over the life of the system.