Buy a heat pump without being sold only BTUs

Compare low-temperature capacity, load calculation and commissioning.

Prepared by RenoAtlas.ca · Last checked: 2026-08-01 · editorial method

Conceptual diagram — actual details depend on the home, product and local requirements.

What you will know after this guide

Ask how home heat loss was estimated and which climate data were used.

Compare capacity and COP at cold temperatures, not only nominal mild-weather capacity.

Airflow, refrigerant charge, drainage, defrost and controls must be checked.