HVAC worker cheat sheets built for repeat field use in Canada
Built for Canada field work where furnaces, air-source heat pumps, hydronic add-ons, and cold-climate comfort expectations all hit the same crew. These are original quick-reference sheets for techs and installers. Use them for faster diagnosis, safer handoffs, and cleaner callbacks. Always follow manufacturer data, lockout/tagout procedure, and local code when the cheat sheet and the equipment disagree.
- Field work often mixes CFM and in. w.c. with metric references, so consistency in the ticket matters.
- Cold-weather operation changes what 'normal' looks like for temperature rise, defrost behavior, and occupancy complaints.
- Combustion and gas notes should reflect the provincial and utility expectations that apply to the site.
- Furnace reliability and airflow issues during long heating seasons.
- Cold-climate heat-pump complaints, auxiliary heat staging, and defrost performance.
- Shoulder-season humidity and condensation problems on mixed heating and cooling systems.
- Provincial fuel-gas, electrical, and refrigeration requirements should guide the repair language and handoff.
- Manufacturer low-ambient data and commissioning steps matter on heat-pump calls that drift into guesswork.
- When a system is left operating with known limitations, document that limitation clearly before you leave.
- For cold-weather furnace and heat-pump troubleshooting.
- Before quoting duct, blower, or auxiliary-heat changes on comfort complaints.
- To keep service notes disciplined across mixed metric and imperial field habits.
Airflow references your crew can use on the next call
Airflow, CFM, and Static Pressure Quick Check
Use this when you have hot and cold rooms, noisy returns, frozen coils, or a unit that feels starved for air.
Cooling Delta-T and Split Temperature Sanity Check
A quick field reference for using return-to-supply temperature difference without over-reading one number.
Electrical references your crew can use on the next call
24V Control Circuit Troubleshooting Ladder
Use this for no-cool, no-heat, or no-fan calls when the low-voltage circuit is the likely control failure point.
Capacitor and Contactor Field Checks
A fast reference for the two outdoor-unit failures you can lose a day on if you skip the basics.
Refrigeration references your crew can use on the next call
Heating references your crew can use on the next call
Heat Pump Defrost Troubleshooting Cheat Sheet
A field-side reference for when the outdoor unit is icing, short-defrosting, or never defrosting at all.
Gas Furnace Sequence of Operation and Safeties
A quick ladder for no-heat calls so you can prove exactly where the sequence breaks.