West Palm Beach FL HVAC permit rules
West Palm Beach Building Services requires mechanical permits for all HVAC equipment installations and replacements. Apply at wpb.org. Florida Certified Air Conditioning Contractor (CAC) license required — verify at myfloridalicense.com. Florida does not require HERS third-party testing. FPL serves all electricity in West Palm Beach (1-800-226-3545); natural gas is limited and often unavailable. Most West Palm Beach homes are all-electric.
West Palm Beach's CZ1A climate is the most cooling-dominated in this guide. The heating design temperature is 36°F — heating is barely needed. The cooling design temperature is 93°F, and the HVAC system runs virtually continuously from April through November. The defining specification challenge in South Florida HVAC is not cold-weather performance — it is latent load management. Relative humidity in West Palm Beach regularly reaches 85–90% during the cooling season. An HVAC system that cycles on and off (short-cycles) removes sensible heat but doesn't run long enough to remove adequate moisture, leaving a home that feels cool but clammy. This is the most common comfort complaint in South Florida HVAC installations.
Variable-speed (inverter-driven) heat pumps and air handlers are the solution to latent load management. By running at lower speeds for longer periods rather than cycling fully on and off, variable-speed systems remove significantly more moisture per cooling degree achieved. For West Palm Beach, a variable-speed system is not a luxury upgrade — it is the appropriate specification for the climate. Single-speed equipment technically meets code but underperforms for comfort in CZ1A.
Federal minimum efficiency for new AC equipment in the South is 15 SEER2 (effective January 1, 2023). Given West Palm Beach's extreme cooling season, higher-SEER2 systems (18+ SEER2) have shorter payback periods than in northern markets because the equipment runs so many more hours annually. Manual J load calculations are critical — and for West Palm Beach specifically, the latent component of the load (moisture removal) must be accurately calculated, not just the sensible component. An improperly sized system that's too large will short-cycle even more severely.
Duct systems in West Palm Beach attics face an extreme efficiency penalty. A CZ1A attic can reach 130–150°F in summer; ducts running through an unconditioned attic of that temperature lose enormous amounts of cooling before it reaches the living space. A sealed/encapsulated attic (spray foam applied to the underside of the roof deck, bringing the attic into conditioned space) dramatically improves system efficiency and is worth pricing alongside any HVAC replacement.
Three West Palm Beach HVAC scenarios
| Factor | What it means for your project |
|---|---|
| Variable-speed = humidity control | Short-cycling removes sensible heat but not moisture. Variable-speed runs longer at lower speed: better latent removal. |
| 15 SEER2 minimum; 18+ recommended | CZ1A runs many more cooling hours than northern markets — higher SEER2 pays back faster. |
| Encapsulated attic | 130–150°F attic without encapsulation kills duct efficiency. Spray foam roof deck. |
| Manual J — latent load critical | Latent (moisture) component as important as sensible. Oversized system short-cycles: worse humidity. |
| No cold-climate HP spec | West Palm Beach: standard heat pump appropriate. No -13°F rating needed. |
Phone: (561) 805-6700 | wpb.org
Florida Contractor Licensing (DBPR): myfloridalicense.com
FPL (Florida Power & Light): 1-800-226-3545 | fpl.com
Sunshine 811 before digging: 811
Common questions about West Palm Beach, FL hvac permits
Why does humidity control matter so much for HVAC in West Palm Beach FL?
West Palm Beach's CZ1A climate has high ambient humidity — 85–90% relative humidity during the cooling season. An HVAC system that's oversized or single-speed short-cycles: it cools quickly but doesn't run long enough to remove adequate moisture, leaving the home feeling cool but clammy. Variable-speed (inverter-driven) systems run at lower speeds for longer periods, removing significantly more moisture per degree of cooling. For West Palm Beach, variable-speed is not a luxury — it's the correct specification for the climate.
What is an encapsulated attic and why does it matter in West Palm Beach?
An encapsulated attic uses spray foam applied to the underside of the roof deck, bringing the attic space into conditioned territory rather than leaving it as an unconditioned hot zone. In West Palm Beach, an uninsulated attic reaches 130–150°F in summer — HVAC ducts running through that heat lose enormous amounts of cooling before it reaches the living space. Encapsulating the attic dramatically improves system efficiency and is worth pricing alongside any HVAC replacement in CZ1A.
Information based on West Palm Beach, FL official sources and applicable state/local building codes as of April 2026. Codes and fees change — verify current requirements before starting work. For a project-specific report, use our permit research tool.