HVAC Installation in St. Augustine, FL
A new system here will heat from December through February and cool from April through October every year. Tell us about the house, and a licensed contractor who covers St. Johns County will get in touch.
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St. Johns County asks more of the cooling side than the heating side
Your air conditioner is the one working most of the year here. Summer afternoons average 90°F, and homes in St. Augustine need cooling from April through October, seven months of the year. Winter is short and mild by comparison, just December through February, with nights averaging 48°F. Between the two, a system here is running ten months out of the year.
That split matters when you're choosing what to install. The condenser and compressor need to hold up through a long, hot cooling season, while the heating side only has to cover three cool months. Almost nine in ten homes here heat with electricity, so whatever you install is likely doing both jobs, and it needs to be sized for the long summer stretch, not just the mild winter.
- 3 months
- December through February, your system heats
- 7 months
- April through October, it cools
- 48°F
- the average winter night it heats against
- 90°F
- the average summer afternoon it cools against
NOAA nClimDiv, 1991–2020 normals
Florida requires HVAC contractors to hold a state license.
The license is held by the contractor, not tied to any single address or job, so the same license that qualifies someone to work in Miami qualifies them in St. Johns County. The Construction Industry Licensing Board tests and records the person or company before that license is issued, so a licensed contractor here has already been checked by the state, not just registered with it.
For a heating and cooling installation, that license is what stands behind the work. Alongside it, most cities and counties in Florida require a permit for this kind of job, and an inspection once it is done, which is a separate check from the local building office on top of the state license.
Sources: Florida Legislature · Florida Department of Business and Professional Regulation
- When should I replace my HVAC system?
- Replace it when repairs get expensive and frequent, or when the system is old enough that another breakdown is just a matter of time. A rising energy bill with no other explanation is also a sign the equipment is losing efficiency. Homes here need heat or cooling 10 months of the year, so a system on its last legs does not get much rest between seasons. A contractor can look at the age, the repair history, and the condition of your specific system and tell you whether replacing it now makes more sense than fixing it again.
- Should I replace my furnace and air conditioner at the same time?
- If they are close in age, replacing them together usually makes sense. A furnace and air conditioner installed at the same time wear out around the same time, so if one is failing the other is not far behind. They also share the same ductwork and airflow, so matching them can mean better performance than pairing an old unit with a new one. If your furnace and air conditioner were installed years apart, a contractor can tell you whether it is worth replacing the working one now or waiting.
- What happens during an HVAC installation?
- A contractor removes the old equipment, sets the new furnace or air conditioner in place, and connects it to the ductwork, electrical, and, for a furnace, the gas or fuel line. Refrigerant lines get connected and tested for leaks. The system then goes through a startup check, where the contractor confirms airflow, thermostat function, and that the system cycles on and off correctly. Most systems come back on by themselves after a power outage, which matters here since 38% of Florida households lost power for at least 24 hours in 2024.