Guide
St. Pete heat and your air conditioner
The figures below are the National Weather Service's 1991 to 2020 daily normals for St. Petersburg. They explain a lot about why summer breakdowns cluster where they do.
(727) 292-1764St. Petersburg normals at a glance
- 90.9°Faverage high in July
- 78.2°Faverage low in August
- 8.39 innormal August rain, the wettest month
- 55.3°Faverage low in January
Source: NWS Tampa Bay, St. Petersburg 1991 to 2020 daily normals (PDF).
Warm nights mean long run times
Through June, July, August and September the normal low stays above 76 degrees. A house that never cools off overnight keeps the compressor running long after sunset, and that is where wear piles up on capacitors, contactors and fan motors.
Rain season and moisture removal
Those four months carry well over half of the year's normal rainfall in the same tables. Wet, sticky air puts a heavy load on the indoor coil, which has to pull moisture out as well as cool. That water has to drain away, which is why blocked condensate lines are a summer fault."
Cooling far outweighs heating
Adding up the monthly degree days in the same normals gives roughly 3,900 cooling degree days against about 360 heating degree days. Put plainly, the air conditioner does most of the year's work here, and the heat gets a short season.
Storms and salt
After Hurricanes Helene and Milton, the city reminded owners that storm repairs need permits and suggested raising HVAC equipment when rebuilding. If an outdoor unit has been under water, the CDC advises having the system checked and cleaned before turning it on, and an electrician check on anything electrical that got wet.
Sources: City of St. Petersburg, the 49% rule; Building Permits; CDC, reentering a flooded home.
Talk it through with an independent contractor
Ring from St. Petersburg, Florida or a neighboring town and mention which rooms stay warm, what the thermostat reads and roughly how old the equipment is. Scope and price stay between you and that independent company.