Our Sources
We cite 1227 sources across 92 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.
Link health is verified nightly via automated checks. Live: 710. Redirect: 64. Dead: 452. See our verification methodology for the full process.
Tier 1 - Government, Regulators, Standards Bodies
- Natural Resources Canada239 citations - 52 live / 187 broken
- Government of Ontario116 citations - 73 live / 43 broken
- Technical Standards and Safety Authority42 citations - 12 live / 30 broken
- CSA Group36 citations - 36 live / 0 broken
- Electrical Safety Authority28 citations - 15 live / 9 broken
- Health Canada27 citations - 8 live / 0 broken
- Canada Mortgage and Housing Corporation26 citations - 14 live / 0 broken
- Ontario Energy Board20 citations - 16 live / 4 broken
- Independent Electricity System Operator18 citations - 18 live / 0 broken
- ENERGY STAR (US EPA/DOE)17 citations - 12 live / 5 broken
- AHRI13 citations - 5 live / 8 broken
- Statistics Canada11 citations - 10 live / 0 broken
- ASHRAE8 citations - 6 live / 2 broken
- Air Conditioning Contractors of America6 citations - 6 live / 0 broken
Tier 2 - Utilities, Industry Associations
- Enbridge Gas34 citations - 21 live / 11 broken
- Save on Energy20 citations - 20 live / 0 broken
- Canadian Home Builders' Association17 citations - 10 live / 7 broken
- Heating, Refrigeration and Air Conditioning Institute of Canada17 citations - 16 live / 1 broken
- Toronto Hydro7 citations - 7 live / 0 broken
- Alectra Utilities4 citations - 1 live / 3 broken
- Hydro One2 citations - 1 live / 1 broken
Tier 3 - Manufacturers, Trade, Other
- www.canada.ca34 citations - 15 live / 0 broken
- www.mitsubishielectric.ca19 citations - 13 live / 0 broken
- www.ccohs.ca16 citations - 10 live / 6 broken
- www.carrier.com15 citations - 12 live / 3 broken
- www.toronto.ca14 citations - 12 live / 2 broken
- www.lennox.com12 citations - 2 live / 10 broken
- www.trane.com10 citations - 3 live / 7 broken
- daikincomfort.com9 citations - 5 live / 4 broken
- www.furnaceprices.ca9 citations - 9 live / 0 broken
- ottawa.ca8 citations - 8 live / 0 broken
- www.ibc.ca8 citations - 2 live / 6 broken
- www.wsib.ca7 citations - 2 live / 5 broken
- homeguide.com6 citations - 6 live / 0 broken
- www.epa.gov6 citations - 4 live / 2 broken
- www.mitsubishicomfort.com6 citations - 3 live / 3 broken
- nrc.canada.ca5 citations - 4 live / 1 broken
- publications.gc.ca5 citations - 5 live / 0 broken
- www.angi.com5 citations - 5 live / 0 broken
- www.consumerreports.org5 citations - 5 live / 0 broken
- www.ecobee.com5 citations - 2 live / 3 broken
- www.hamilton.ca5 citations - 0 live / 5 broken
- www.homerenovationsavings.ca5 citations - 1 live / 0 broken
- www.mississauga.ca5 citations - 2 live / 3 broken
- www.energy.gov4 citations - 1 live / 3 broken
- www.greatersudbury.ca4 citations - 0 live / 2 broken
- www.honeywellhome.com4 citations - 2 live / 2 broken
- www.hvi.org4 citations - 2 live / 2 broken
- www.napoleon.com4 citations - 4 live / 0 broken
- www.ohba.ca4 citations - 0 live / 0 broken
- www.tarion.com4 citations - 3 live / 1 broken
- buildingscience.com3 citations - 2 live / 1 broken
- london.ca3 citations - 3 live / 0 broken
- neep.org3 citations - 2 live / 1 broken
- premierplumbing.ca3 citations - 3 live / 0 broken
- solar-x.ca3 citations - 3 live / 0 broken
- support.google.com3 citations - 0 live / 3 broken
- www.aprilaire.com3 citations - 3 live / 0 broken
- www.enercare.ca3 citations - 3 live / 0 broken
- www.goodmanmfg.com3 citations - 1 live / 2 broken
- www.homestars.com3 citations - 3 live / 0 broken
- www.hvac-talk.com3 citations - 3 live / 0 broken
- www.keeprite.com3 citations - 3 live / 0 broken
- www.smacna.org3 citations - 1 live / 2 broken
- broan-nutone.com2 citations - 2 live / 0 broken
- climate.weather.gc.ca2 citations - 2 live / 0 broken
- enovapower.com2 citations - 1 live / 1 broken
- greenbuildingcanada.ca2 citations - 2 live / 0 broken
- gsu.ca2 citations - 0 live / 2 broken
- guelph.ca2 citations - 1 live / 1 broken
- hvac-talk.com2 citations - 2 live / 0 broken
- laws-lois.justice.gc.ca2 citations - 2 live / 0 broken
- lunghealth.ca2 citations - 0 live / 2 broken
- reliancehomecomfort.com2 citations - 2 live / 0 broken
- tc.canada.ca2 citations - 2 live / 0 broken
- utilitieskingston.com2 citations - 0 live / 2 broken
- westboroflooring.com2 citations - 2 live / 0 broken
- www.barrie.ca2 citations - 0 live / 2 broken
- www.brampton.ca2 citations - 1 live / 1 broken
- www.cityofkingston.ca2 citations - 0 live / 2 broken
- www.citywindsor.ca2 citations - 0 live / 2 broken
- www.custom-contracting.ca2 citations - 2 live / 0 broken
- www.enwin.com2 citations - 0 live / 2 broken
- www.londonhydro.com2 citations - 0 live / 2 broken
- www.lung.ca2 citations - 2 live / 0 broken
- www.navieninc.com2 citations - 0 live / 2 broken
- www.orea.com2 citations - 2 live / 0 broken
- www.pbo-dpb.ca2 citations - 2 live / 0 broken
- www.resideo.com2 citations - 1 live / 1 broken
- www.uponor.com2 citations - 0 live / 2 broken
- www.viessmann.ca2 citations - 2 live / 0 broken
- www.wettinc.ca2 citations - 2 live / 0 broken