The John Davis Blog

Blog: Straight Answers About Your Heating & Air

Plain-English HVAC tips from a family-owned company since 1968.

Furnace not heating: an attic gas furnace with its panel off and the green diagnostic light showing on the control board
Troubleshooting

Why Is My Furnace or Heat Pump Not Heating My House?

The first cold night arrives and the heat won't come on, blows cold, or shuts off. Here's how a furnace and a heat pump actually make heat, what to check first, and when to shut it off and call.

By John Davis & Team • October 15, 2026
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Frozen AC compressor covered in ice inside an outdoor unit, a common reason an AC runs but doesn't cool
Troubleshooting

Why Is My AC Running but Not Cooling My House?

It's running, you can hear it, but the house won't cool. Here's how an air conditioner actually moves heat, what to check first, what each symptom points to, and when to turn it off and call.

By John Davis & Team • October 7, 2026
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John Davis Heating and Air technician smiling beside an outdoor AC unit during a tune-up with gauges connected
Maintenance

How Often Should I Have My Heating and AC Serviced?

Twice a year: once in spring for your air conditioning, and once in fall for your heating. Here's what a tune-up includes, how to tell a good one from a quick look, and how the JD Air Care Plan fits in.

By John Davis & Team • October 2, 2026
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Troubleshooting

Why is my AC freezing up in a Georgia summer?

This article is on the way. Check back soon for more HVAC tips from our team.

Coming soon