Cooling in Palm Bay
In Palm Bay the air conditioner is the main appliance in the house for most of the year. Winters are short and mild, so the questions that matter are how well a system dries the air, how long it lasts in salt-tinged coastal weather and how it holds up when a storm comes through.
The numbers a contractor should use
NOAA's nearest engineering weather station is Melbourne, on Palm Bay's northern border. It gives a 1% summer design temperature of 91°F with a mean coincident wet-bulb of 79°F, and a 99% winter design temperature of 42°F. That wet-bulb figure is high: the air here holds a lot of water even on ordinary summer days. A proper load calculation uses design values like these, not the square footage alone. Ask for one in writing.
Humidity is the real load
Melbourne logs about 3,244 hours a year with the wet-bulb temperature above 73°F, and about 5,447 hours above 67°F. That is most of the year. A system that is too large cools the rooms quickly and shuts off before it has wrung much water out of the air, and the house ends up cool but damp, with musty closets and sweating ducts. Ask the contractor how the proposed equipment handles moisture: variable-speed or two-stage compressors, slower fan speeds, and whether a whole-house dehumidifier is worth considering for your home.
Heat pumps fit this climate
With a 99% winter design temperature of 42°F, a heat pump can cover winter heating easily in most Palm Bay homes. Ask whether backup electric heat is needed at all, and how the thermostat will keep it from running when the heat pump alone would do.
Efficiency rules
Florida is in the Department of Energy's hot-humid Southeast region. Split-system central air conditioners installed on or after January 1, 2023 must be rated at least 14.3 SEER2 (13.8 SEER2 for 45,000 Btu/h and larger), and split-system heat pumps must meet 14.3 SEER2 and 7.5 HSPF2. With cooling running most of the year, the operating-cost difference between ratings adds up faster here than in most places. Ask for an estimate for your house.
Wind and the outdoor unit
NOAA lists a 50-year basic wind speed of 140 mph for Melbourne. Ask how the condenser will be secured to its pad or stand, whether the installation meets current wind requirements, and what the contractor recommends for protecting the unit from flying debris. After a storm, have the unit checked before running it if it was flooded or hit.
Ducts and the attic
Many homes here run ducts through hot attics. Leaks pull in humid attic air and cancel out part of what you paid for in efficiency. Ask for duct sealing to be quoted separately and for insulation on any duct that sweats.
Check the license
Florida HVAC contractors hold either a state certificate, with a license number beginning with C, or a registration beginning with R that covers only certain local jurisdictions. Look the contractor up on DBPR's license search and make sure the license type covers mechanical work where you live.
Comparing quotes
Ask every contractor for model numbers, SEER2 and HSPF2 ratings, the load calculation, duct work, drain line and float switch, thermostat, permit and warranty terms for parts and labor.