Our Sources
We cite 777 sources across 89 publishers in our guides. Tier 1 sources (Canadian and Ontario government, regulators, and standards bodies) are our authoritative spine. We don't cite competitor blogs or contractor marketing pages.
See our verification methodology for how we vet sources.
Tier 1 - Government, Regulators, Standards Bodies
- Government of Ontario92 citations
- Natural Resources Canada75 citations
- CSA Group36 citations
- Health Canada27 citations
- Canada Mortgage and Housing Corporation26 citations
- Electrical Safety Authority24 citations
- Technical Standards and Safety Authority19 citations
- Independent Electricity System Operator18 citations
- Ontario Energy Board16 citations
- ENERGY STAR (US EPA/DOE)15 citations
- Statistics Canada11 citations
- AHRI10 citations
- ASHRAE8 citations
- Air Conditioning Contractors of America6 citations
Tier 2 - Utilities, Industry Associations
- Enbridge Gas28 citations
- Save on Energy20 citations
- Heating, Refrigeration and Air Conditioning Institute of Canada16 citations
- Canadian Home Builders' Association13 citations
- Toronto Hydro7 citations
- Alectra Utilities2 citations
- Hydro One2 citations
Tier 3 - Manufacturers, Trade, Other
- www.canada.ca34 citations
- www.mitsubishielectric.ca19 citations
- www.carrier.com13 citations
- www.ccohs.ca13 citations
- www.toronto.ca13 citations
- www.furnaceprices.ca9 citations
- www.lennox.com9 citations
- daikincomfort.com8 citations
- ottawa.ca8 citations
- www.trane.com8 citations
- homeguide.com6 citations
- www.epa.gov6 citations
- www.ibc.ca6 citations
- www.mitsubishicomfort.com6 citations
- publications.gc.ca5 citations
- www.angi.com5 citations
- www.consumerreports.org5 citations
- www.ecobee.com5 citations
- www.homerenovationsavings.ca5 citations
- nrc.canada.ca4 citations
- www.energy.gov4 citations
- www.honeywellhome.com4 citations
- www.napoleon.com4 citations
- www.ohba.ca4 citations
- www.wsib.ca4 citations
- london.ca3 citations
- premierplumbing.ca3 citations
- solar-x.ca3 citations
- www.aprilaire.com3 citations
- www.enercare.ca3 citations
- www.hamilton.ca3 citations
- www.homestars.com3 citations
- www.hvac-talk.com3 citations
- www.hvi.org3 citations
- www.keeprite.com3 citations
- www.mississauga.ca3 citations
- www.smacna.org3 citations
- www.tarion.com3 citations
- broan-nutone.com2 citations
- buildingscience.com2 citations
- climate.weather.gc.ca2 citations
- enovapower.com2 citations
- greenbuildingcanada.ca2 citations
- gsu.ca2 citations
- guelph.ca2 citations
- hvac-talk.com2 citations
- laws-lois.justice.gc.ca2 citations
- neep.org2 citations
- reliancehomecomfort.com2 citations
- tc.canada.ca2 citations
- utilitieskingston.com2 citations
- westboroflooring.com2 citations
- www.barrie.ca2 citations
- www.brampton.ca2 citations
- www.cityofkingston.ca2 citations
- www.citywindsor.ca2 citations
- www.custom-contracting.ca2 citations
- www.enwin.com2 citations
- www.goodmanmfg.com2 citations
- www.greatersudbury.ca2 citations
- www.londonhydro.com2 citations
- www.lung.ca2 citations
- www.navieninc.com2 citations
- www.orea.com2 citations
- www.pbo-dpb.ca2 citations
- www.uponor.com2 citations
- www.viessmann.ca2 citations
- www.wettinc.ca2 citations