Frequently Asked Questions

Use these conditions as a practical filter before committing to either path. Lean toward repair if: • The system is under 10 years old and well-maintained • The 5,000-rule result is below $4,500 • The repair cost is below 30% of new system cost • No compressor, coil, or refrigerant-type issue is involved Lean toward replacement if: • The system is 12 years or older, especially without consistent maintenance • The 5,000-rule result exceeds $4,500–$5,000 • The repair involves the compressor and the unit is 8+ years old • The system uses R-22 refrigerant • You have paid for repairs in consecutive cooling seasons

Technicians test flame sensors, limit switches, and electrical connections to confirm safe operation and prevent hazards like overheating or gas leaks. Flame sensors detect whether the burner is lit and shut off gas flow if ignition fails, preventing dangerous buildup. Limit switches monitor internal temperatures and stop the system if it overheats, protecting against fire risk. Electrical connections must be tight and corrosion-free to ensure reliable power delivery and prevent arcing. Loose wires can cause intermittent operation or complete system failure during peak demand. Inspecting these controls reduces the risk of emergency breakdowns and extends equipment lifespan. Technicians also verify proper ventilation to ensure combustion gases vent safely outdoors.

Too little refrigerant reduces cooling capacity and causes the evaporator coil to freeze, while too much refrigerant strains the compressor and reduces efficiency. Refrigerant charge must match manufacturer specifications exactly. Installers measure charge by weight or superheat and subcooling values, not by pressure alone. Undercharged systems run constantly without reaching set temperatures. Overcharged systems cycle erratically and may damage the compressor over time. Proper refrigerant charge ensures efficient heat transfer, reliable cooling, and long equipment life. Reasonable Air verifies charge during installation and startup, adjusting as needed for optimal performance.

Heat pumps deliver the greatest savings in climates with mild winters, where electric resistance heating or gas furnaces consume more energy per cycle. Lowcountry winter temperatures rarely drop below freezing, allowing heat pumps to operate efficiently without supplemental heating. The system's ability to move heat rather than generate it results in lower monthly utility bills compared to baseboard heaters or older furnaces. Installation costs are often offset within a few years through reduced energy consumption. Homes without existing ductwork also benefit from ductless mini-split heat pumps, which avoid the expense of duct installation.

Between pollen, humidity, and dust, summer air quality inside your home can take a hit. Here's what actually works. •High-efficiency filters and sealed ductwork reduce pollen infiltration. Regular filter changes during peak pollen months prevent buildup and maintain airflow. •Whole-home air purifiers provide an additional layer of protection, capturing pollen before it reaches living spaces and reducing allergy symptoms for sensitive occupants. Indoor air quality solutions in Summerville, SC address coastal humidity, pollen, and biological contaminants with filtration, dehumidification, and UV technology suited to Lowcountry conditions. Reasonable Air can recommend and install air quality systems that improve health and comfort. Experience cleaner indoor air with Reasonable Air by calling to discuss filtration, dehumidification, and UV lamp options.

Technicians clean coils, test electrical components, verify refrigerant charge, and inspect airflow to ensure the system operates safely and efficiently. Coil cleaning removes dirt and debris that insulate surfaces and reduce heat transfer, forcing the compressor to work harder. Dirty coils also trap moisture and promote mold growth in humid climates. Refrigerant levels are measured to confirm proper charge, as low levels indicate leaks that reduce cooling capacity. Electrical connections are tightened and tested to prevent shorts or overheating. Airflow is checked at vents and the air handler to identify restrictions caused by clogged filters or duct obstructions. For additional support with cooling system upkeep, consider joining our "Castle Comfort Club" for scheduled maintenance visits.

In Summerville's climate, a system at 10 years old enters the serious decision window, a 12-to-13-year-old system should lean toward replacement, and anything 15 years or older should almost always be replaced unless the repair is minor and inexpensive. One hard flag: if your system still uses R-22 refrigerant (phased out federally in 2020), recharging it costs far more than R-410A and the supply is shrinking. An R-22 system is almost always a replacement candidate regardless of age. Single-stage systems also struggle under SC humidity loads and typically cannot maintain comfort even when mechanically sound. A solid preventive maintenance plan can extend a system's useful life, but poor maintenance history works the other way — it lowers the age threshold at which replacement becomes the smarter call. little refrigerant reduces cooling capacity and causes the evaporator coil to freeze, while too much refrigerant strains the compressor and reduces efficiency. Refrigerant charge must match manufacturer specifications exactly. Installers measure charge by weight or superheat and subcooling values, not by pressure alone. Undercharged systems run constantly without reaching set temperatures. Overcharged systems cycle erratically and may damage the compressor over time. Proper refrigerant charge ensures efficient heat transfer, reliable cooling, and long equipment life. Reasonable Air verifies charge during installation and startup, adjusting as needed for optimal performance.

It's a $10 filter, but skipping it can cost you hundreds. Here's what actually happens to your system when the filter gets clogged. Frozen coils result from restricted airflow, low refrigerant levels, or dirty filters that block air circulation over the evaporator. When airflow drops, the coil temperature falls below freezing and traps moisture from the humid Summerville air. Ice buildup insulates the coil and prevents heat exchange entirely. Your system may shut down or blow warm air despite running continuously. Cleaning or replacing filters often resolves minor airflow restrictions. More severe cases may require a technician to check refrigerant charge and test blower motor performance. For comprehensive system evaluations, explore HVAC maintenance services to prevent recurrence.