Understanding the difference matters because it changes where a technician looks first when something goes wrong. Below is a plain-English breakdown of the parts that make a heat pump different, the symptoms that are specific to them, and why this equipment is so common in homes in this part of Brevard County.
What Makes a Heat Pump Different From an AC
A standard air conditioner has a one-way refrigerant circuit: it always pulls heat from indoor air and dumps it outside. A heat pump adds a component called a reversing valve, which can redirect refrigerant flow so the same outdoor coil that rejects heat in summer instead absorbs heat from outside air in winter and delivers it inside. Everything else — the compressor, the indoor coil, the blower, the thermostat wiring — is largely the same hardware doing double duty. That shared hardware is also why heat pump problems can show up in either mode depending on which part is at fault.
The Reversing Valve
The reversing valve is a solenoid-controlled valve that physically redirects refrigerant. When it fails to shift — because the solenoid coil burns out, the valve sticks from age, or it never gets the control signal — the system gets stuck running in whichever mode the valve was last sitting in. A homeowner might report that switching the thermostat from cool to heat does nothing, or that the system blows cold air even in heat mode. Diagnosing this means checking refrigerant temperatures on both sides of the valve while it's commanded to switch.
Defrost Control and Winter Icing
In heating mode, the outdoor coil gets cold enough that moisture in the air can frost onto it, the same way a freezer builds frost. A defrost control board monitors coil temperature and periodically reverses the system briefly to melt that ice, often kicking on the auxiliary heat so the house doesn't feel a cold-air blast during the cycle. Light frost is normal; a coil that stays heavily iced or never triggers a defrost cycle usually means the defrost sensor, timer board, or the reversing valve itself isn't doing its job.
Auxiliary and Strip Heat
Most heat pump systems include electric resistance heat strips in the indoor air handler as a backup for temperatures the heat pump alone can't keep up with, and to cover the brief gap during a defrost cycle. If a home only gets lukewarm air during a cold snap, or the system runs constantly without reaching the set temperature, the heat strips may not be energizing — often a failed relay or a tripped high-limit switch. Because strip heat pulls significant electrical current, a tripped breaker is also worth checking here.
Cooling-Mode Failures Aren't Always Heat Pump Specific
When a heat pump fails to cool, the cause is frequently the same as any AC system — a low refrigerant charge, a failed capacitor, or a dirty condenser coil. These parts and symptoms are covered in more detail on the AC repair page. The heat-pump-specific troubleshooting really comes into play for heating complaints, mode -switching complaints, and defrost-cycle behavior.
Why This Equipment Is So Common Here
Heat pumps make sense in this climate because winters are short and mild enough that the outdoor air almost never drops below the point where a heat pump becomes inefficient. Since many homes in Palm Bay also don't have gas lines run to them, a heat pump lets one piece of outdoor equipment cover both heating and cooling instead of installing a separate furnace. That's part of why heat pump repair calls in this area often involve heating-side symptoms homeowners have never had to think about with a straight-cool system.
Not sure which mode is failing?
Call 321-334-2567 and describe what the thermostat is set to versus what the system is actually doing — that alone often narrows the problem down before a technician arrives.
Symptoms Worth Flagging Specifically as Heat Pump Issues
Tell whoever answers the phone if you're seeing any of these, since they point toward heat-pump-specific components rather than general AC parts: no heat produced while cooling mode still works fine, the system stuck running one mode no matter the thermostat setting, or visible ice buildup on the outdoor coil during cool weather that doesn't clear on its own. Each of these narrows the likely cause before a technician even opens a panel, which keeps the visit focused. For thermostat-side confusion about mode settings, see thermostat repair, and use the repair cost calculator for a general cost range.