Cooling hours age heat stage parts
South Florida heat pumps may use heat mode only a few days per year. Reversing valves, defrost boards, auxiliary strips, and sequencers still sit in service and can fail without a long heat season. Weak warmth at the register or a stat stuck in cool mode on a cold morning overlaps control faults, airflow limits, and heat stage failures. A planned mode test before demand spikes reduces emergency volume on the first cold week.
Changeover test scope
Verify stat and outdoor unit mode commands. Measure supply air temperature rise in heat when outdoor conditions allow. Observe defrost behavior where applicable.
Check auxiliary heat amperage and sequencer operation on systems that use strip heat. Inspect outdoor coil condition. Dirty fins reduce heat mode performance the same way they reduce cooling efficiency. Document whether the stat offers auxiliary lockout and whether the owner uses it.
Typical findings
Stuck reversing valves: cool air in heat mode or poor heat transfer. Weak auxiliary strips: lukewarm supply that does not meet setpoint on cold mornings. Condensate issues left from cooling season can still damage ceilings if pans or lines were marginal. Repairs route through heat pump repair and A/C repair on dual mode equipment.
Airflow and stat overlap
Weak air in every mode may need air duct and vent repair before heat stage parts are replaced. Stat in wrong location can end heat calls early in one zone while another room stays cold. See thermostat installation. Humidity after heat runs may still need dehumidifier services when latent load stays high.
Book the visit
Combine with maintenance plans when cooling service already occurred. Send equipment type and fault codes to contact us or call (305) 255-6671. See maintenance intervals on the blog. service area, about. We may run heat mode briefly in fall when load is low to verify valve shift and strip operation. Defrost test may be deferred when outdoor temperatures do not allow a meaningful cycle. Auxiliary heat lockout temperature is confirmed with the owner when high electric bills are a concern. Crankcase heater operation is noted on commercial condensing units. Reversing valve sound during shift is recorded as normal click or abnormal chatter. Supply air temperature rise minimum is compared to manufacturer spec for heat mode. Emergency heat setting use is discouraged without documenting strip amperage first. We recommend the visit before the first week of sustained night temperatures below fifty degrees when possible.
Outdoor fan motors that ran all summer may start heat mode with bearing noise. Defrost boards that worked in test last year may fail when frost actually forms. Strip heat sequencers welded shut can run aux heat during cool mode unnoticed until bills rise. Filter neglect in summer restricts heat mode airflow the same as cooling. Drain pan sludge from summer can smell when heat mode dries the pan quickly. We log whether the owner used heat at all last year to set expectations for strip tests. Package units on flat roofs may need level check before heat season condensate routing. Thermostat software updates sometimes reset aux lockout; we confirm settings after updates. The report states whether heat mode produced acceptable supply rise at the time of test or whether cold weather retest is needed. Auxiliary heat amperage values are recorded when strips energize during the visit. Reversing valve shift is recorded as normal or abnormal based on technician observation and supply temperature change. Defrost board fault codes are cleared and listed if they appeared during testing.
Owner is told which stat setting to use for first cold morning so the test matches real use. Items deferred due to warm outdoor temperature are listed with a recommended retest window. Combined cooling and heating maintenance savings are not promised. Only tasks completed and tasks deferred are listed. Phone number for heat no heat calls after the visit is repeated on the summary page. Auxiliary strip heat draws high amperage; owners should know when strips energize during the test. Heat pump alone may feel lukewarm compared to gas heat; that is normal at moderate outdoor temperatures. Emergency heat setting bypasses heat pump efficiency; we confirm owners understand the cost difference. Defrost cycle during borderline weather can feel like cold air at the register briefly. Heat mode with dirty outdoor coil may run long without satisfying stat until coil is cleaned. We document stat model because some models hide aux heat indicator from the owner view.