04/19/2026
🔥 These photos show a real combustion test on a gas furnace.
This inspection was done because the home was up for sale and the buyer requested a furnace check before moving in.
The readings showed high carbon monoxide (CO) levels along with elevated gas pressure (manometer readings) during combustion analysis.
⚠️ The furnace was still running and heating the home normally, but issues like this can go unnoticed without proper testing.
🛠️ This is exactly why annual maintenance is important. It helps ensure:
• Safe combustion
• Correct gas pressure
• Proper system operation
• Early detection of hidden issues
📅 Annual maintenance isn’t just about efficiency—it’s about safety and peace of mind.
— The HVAC Squad
