HVAC & AC FAQ

The most common reasons are a clogged air filter, low refrigerant due to a leak, or a dirty condenser coil outside. Check your filter first—if it's clean, you likely need a pro to check the refrigerant levels.

Air conditioners freeze when there isn't enough warm air blowing over the indoor coil, or when the pressure drops too low. This is almost always caused by either a severely clogged air filter or a refrigerant leak.

Your AC naturally pulls humidity out of the air, which drips into a drain pan and flows outside. If water is backing up, the PVC drain line is clogged with algae and dirt. It needs to be flushed.

This is known as 'Dirty Sock Syndrome.' It happens when mold and bacteria build up on the dark, damp indoor evaporator coil. A professional coil cleaning or installing a UV light inside the system will fix it.

Short-cycling is when the AC turns on and off every few minutes without fully cooling the house. It's usually caused by an oversized unit, a failing thermostat, or a safety switch tripping due to low refrigerant.

If your thermostat reads a different temperature than what you set, it could be placed near a heat source, in direct sunlight, or on a poorly insulated wall. It could also mean your system is undersized or losing efficiency due to dirty coils or low refrigerant.

Your AC removes humidity as a byproduct of cooling, but if it's oversized, it cools too fast and shuts off before pulling enough moisture from the air. A two-stage or variable-speed system handles humidity much better than a basic single-stage unit.

Uneven cooling is usually caused by undersized or leaky ductwork, closed or blocked vents, or poor insulation in certain areas. A qualified technician can perform a room-by-room airflow test to pinpoint the problem and recommend fixes like duct modifications or a zoning system.

Consider the age of the unit, the cost of the repair, and the type of refrigerant it uses. If the unit is over 15 years old and the repair costs more than $1,000, replacement is usually the better financial decision.

Multiply the age of your equipment by the estimated cost of the repair. If the total exceeds $5,000, replace the system. If it's less than $5,000, repair it. (e.g., a 10-year-old AC with a $600 repair = 6,000 -> Replace).

A modern central air conditioner typically lasts 15 to 20 years with proper maintenance. Heat pumps, which run year-round for both heating and cooling, usually last 12 to 15 years.

Usually no. R-22 (Freon) is banned from production due to environmental regulations. Supplies are dwindling, making it incredibly expensive (up to $150+ per pound). It's better to invest that money in a new system.

Most manufacturers offer a 5 to 10 year parts warranty, but labor is usually only covered for the first year unless you registered the equipment within 60 days of installation. Always check your warranty paperwork before authorizing a repair—it could save you hundreds.

Standard homeowner's insurance covers sudden damage from events like lightning strikes or fallen trees, but it does not cover wear and tear or equipment that simply wore out. A home warranty (a separate product) may cover mechanical failures, but read the fine print carefully.

SEER (Seasonal Energy Efficiency Ratio) measures efficiency. The federal minimum is currently 14 or 15 depending on your region. In mild climates, a 15 SEER is fine. In hot southern climates, investing in 16 to 18 SEER will pay for itself in energy savings.

Most HVAC systems share the exact same internal components (like Copeland compressors). Installation quality matters 10x more than the brand name on the box. However, Trane, Carrier, and Lennox are premium brands, while Goodman and Rheem are solid budget options.

Single-stage runs at 100% capacity until it turns off. Two-stage has a high and low setting. Variable-speed runs constantly at very low speeds (like dimming a light switch) to maintain perfect temperature and humidity.

Always get three quotes. Compare the exact models being offered, the warranties, and what is included (e.g., new thermostat, duct modifications, permit fees). Throw out the highest and lowest if they are extreme outliers.

Yes, most reputable HVAC contractors offer financing through third-party lenders with terms ranging from 12 to 120 months. Many manufacturers also run promotional 0% interest offers during peak season. Always compare the APR and total cost of the loan before signing.

In most cities and counties, yes. A mechanical permit is required for HVAC installations and ensures the work is inspected for safety and code compliance. Your contractor should pull the permit—if they suggest skipping it, that's a major red flag.

A straightforward replacement of an existing system typically takes one day, usually 6 to 8 hours. If ductwork modifications, electrical upgrades, or a system relocation are involved, it can take two days. Complex installations with new duct runs may take three days.

Yes. Modern cold-climate heat pumps use variable-speed inverter technology to extract heat from the air in temperatures as low as -15°F. Brands like Mitsubishi and Bosch excel in northern climates.

Mechanically, they are nearly identical. The difference is a heat pump has a 'reversing valve' that allows it to run backward in the winter, pulling heat from outside and bringing it inside to warm your house.

Yes, heavily. Under the Inflation Reduction Act, you can claim a 30% federal tax credit up to $2,000 for a qualifying heat pump. There are also state-level rebates available for low and moderate-income households.

A ductless mini-split is a small heat pump that mounts on a wall and conditions a single room or zone without ductwork. They are ideal for additions, garages, sunrooms, or older homes where installing ducts would be impractical or too expensive.

Geothermal systems use the constant temperature of the earth to heat and cool, making them incredibly efficient—up to 400% efficient in heating mode. However, the upfront cost is significantly higher due to ground loop installation. They pay for themselves in 7 to 12 years through energy savings.

A hybrid system pairs an electric heat pump with a gas furnace. The heat pump handles mild winter temperatures efficiently, and the gas furnace kicks in only when it gets extremely cold. This setup gives you the best efficiency across all temperature ranges.

A new central air conditioning system typically costs between $4,000 and $12,000 installed, depending on the size, efficiency rating, and brand. High-efficiency or variable-speed systems with premium features can run $10,000 to $15,000 or more.

Common add-on costs include permit fees, thermostat upgrades, duct modifications, refrigerant line sets, and disposal of the old equipment. A reputable contractor will itemize everything upfront. If a quote seems vague or unusually low, ask what's excluded.

Yes, many contractors offer lower prices or promotional deals during fall and early spring when demand is slow. Manufacturers also run seasonal rebates during these periods. Avoid emergency replacements in July—that's when prices and wait times peak.

Minor repairs like a capacitor or contactor replacement usually cost $150 to $400. Mid-range repairs like a blower motor or control board run $400 to $900. Major repairs like a compressor or evaporator coil replacement can cost $1,200 to $2,500 or more.

Extended warranties can be worth it if they cover both parts and labor, which is where the real cost lies. Read the terms carefully—some only cover parts and require you to pay a service call fee. A 10-year parts-and-labor warranty from a reputable contractor is a solid investment.

SEER stands for Seasonal Energy Efficiency Ratio and measures how efficiently your AC converts electricity into cooling over a full season. SEER2 is the updated testing standard introduced in 2023 that uses slightly more realistic conditions. Higher numbers mean lower electric bills.

Yes, a properly programmed thermostat can reduce your heating and cooling costs by 10% to 15% per year. Smart thermostats like Ecobee and Google Nest learn your schedule and adjust automatically, which prevents waste when nobody is home.

The average home loses 20% to 30% of its conditioned air through leaky, poorly connected, or uninsulated ducts. That means nearly a third of the energy you're paying for never reaches your living space. Professional duct sealing can dramatically improve comfort and efficiency.

Absolutely. Poor attic insulation is one of the biggest causes of high energy bills and an overworked AC. Heat radiates through the ceiling into your living space, forcing your system to run longer. Adding insulation to R-38 or higher can reduce cooling costs by 15% to 25%.

Zoning uses motorized dampers in your ductwork and multiple thermostats to independently control the temperature in different areas of your home. It's especially valuable for multi-story homes, rooms with large windows, or areas that are consistently too hot or too cold.

R-410A has been the industry standard since 2010, but R-32 is replacing it because it has a lower global warming potential and requires less refrigerant per system. New equipment manufactured after January 2025 transitioned to R-32 and other lower-GWP alternatives.

R-22 production and import were fully banned in the U.S. in 2020. If your system still uses R-22 and develops a leak, the refrigerant is extremely expensive and increasingly hard to find. Replacing the system is almost always more cost-effective than recharging with reclaimed R-22.

The EPA requires that only certified technicians handle refrigerants, and it is illegal to knowingly vent refrigerant into the atmosphere. Technicians must recover and reclaim refrigerant during repairs or system disposal. Violations can result in fines up to $44,539 per day per violation.

Small leaks on accessible connections can sometimes be soldered for $200 to $600. Leaks inside the evaporator coil or condenser coil usually require replacing the entire coil, which can cost $1,000 to $2,500. If the system is old, replacement often makes more financial sense.

Duct cleaning can be beneficial if you see visible mold, excessive dust, or have had rodents or insects in your ducts. However, routine duct cleaning every year is generally unnecessary. The EPA recommends cleaning only when there's a specific problem, not as a regular maintenance item.

Signs of duct problems include rooms that won't cool, excessive dust on furniture, high energy bills, and visible gaps or disconnected joints in exposed ductwork. A professional can perform a duct leakage test to measure exactly how much air you're losing.

Yes, UV-C germicidal lights installed near the indoor coil are effective at killing mold, bacteria, and some viruses on the coil surface. They help prevent Dirty Sock Syndrome and keep the coil clean, which maintains efficiency. They do not, however, filter particles from the air.

If anyone in your household has allergies, asthma, or respiratory issues, a whole-home air purification system can make a significant difference. Options range from high-MERV media filters to electronic air cleaners and bipolar ionization systems. Talk to your HVAC contractor about what works best for your system.

A whole-home dehumidifier installed in your duct system is the most effective solution for homes with persistent humidity problems. It works independently of your AC and can remove 70 to 100 pints of moisture per day. This is especially helpful in humid climates or tightly sealed newer homes.

Check with your state's contractor licensing board or department of professional regulation—most have an online lookup tool. A legitimate contractor should have a state or local HVAC license, general liability insurance, and workers' compensation coverage. Ask to see proof before signing anything.

Get at least three written quotes from different licensed contractors. Make sure each quote specifies the exact equipment model, SEER rating, warranty terms, and what's included in the installation. This allows you to make an apples-to-apples comparison and avoid overpaying.

The manufacturer warranty covers defective parts (like the compressor or coil) and typically lasts 5 to 10 years. The contractor's labor warranty covers the cost of the technician's time to diagnose and install the replacement part. Make sure you have both—parts without labor coverage can still cost you hundreds.

Watch out for contractors who demand full payment upfront, refuse to pull permits, can't show proof of insurance, or pressure you into an immediate decision. Other warning signs include no written contract, no physical business address, and quotes that are dramatically lower than competitors.