iHVAC Journal
HVAC guides, fixes & pro tips.
Plain-language walkthroughs for homeowners. Technical depth for working techs. All free, written by people who know the equipment — not AI filler.
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For homeownersAC repairtroubleshooting
Before You Call a Tech: 5 Reasons Your AC Isn't Cold
Your AC is running but the air isn't cold. In 80% of cases, it's one of five things — and three of them you can fix yourself in under 30 minutes.
4 min read
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For techsfurnaceignition
Flame Sensor Cleaning: Field Guide for Working Techs
Flame sensors fail soft — intermittent lockouts, delayed ignition, code 33 on Carriers. Here's the 20-minute diagnostic before you condemn the board.
3 min read
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For homeownerstipsmaintenance
What Your HVAC Tech Wishes You Knew Before They Showed Up
The five pieces of information that turn a two-hour service call into a 45-minute one — and save you money while you're at it.
3 min read