What size heat pump does your home need?

Getting the size right is the single biggest factor in whether your heat pump is comfortable, efficient and long-lived. Here's how it actually works.

Tons and BTUs, explained.

Heat pumps are rated in tons or BTUs — one ton equals 12,000 BTUs of heating and cooling capacity per hour. A small island home might need 1.5–2 tons; a larger or leakier home, 3–5 tons or a multi-zone system.

But capacity alone tells you nothing until it's matched to your home.

Why bigger is not better.

An oversized heat pump heats the space too fast, then shuts off — over and over. That short-cycling means uneven temperatures, more wear, poorer dehumidification and higher bills. An undersized unit, on the other hand, runs constantly and struggles on the coldest days.

The sweet spot is a system sized to run long, steady cycles that match your home's actual heat loss.

The right way: a load calculation, not a guess.

Square-footage rules of thumb ignore the things that actually drive heating and cooling load. A proper CSA F280-12 / Manual J load calculation accounts for them all:

We run this calculation on every install — it's the difference between a system that just fits and one that's genuinely right.

Island-specific factors.

Older Victoria and Cowichan homes often have original windows and modest insulation, which raises the load. Oil-to-heat-pump conversions sometimes pair with an envelope upgrade that lowers it. The point: your neighbour's system size is a poor guide to yours.

Frequently asked questions

How many tons do I need for a 2,000 sq ft house?

There's no honest one-size answer — it depends on insulation, windows, layout and exposure. A 2,000 sq ft home could need anywhere from 2 to 4 tons. A load calculation gives the real number.

What happens if my heat pump is oversized?

It short-cycles — heating quickly then shutting off repeatedly. That causes temperature swings, poor humidity control, extra wear, and higher energy use. Correct sizing avoids all of it.