Question 1

What is a UV germicidal light?

Accepted Answer

UV lights are installed inside your HVAC system to kill mold, bacteria, and viruses as air passes through. They're especially effective at preventing mold growth on the evaporator coil.

Question 2

Do whole-home air purifiers really work?

Accepted Answer

Yes. Whole-home HEPA filtration and electronic air cleaners are far more effective than portable room units because they treat all the air in your home as it circulates through the HVAC system.

Question 3

How do I know if I need a humidifier or dehumidifier?

Accepted Answer

If you experience dry skin, static electricity, or cracking wood in winter, you need a humidifier. If your home feels sticky or you see condensation on windows in summer, a dehumidifier will help.

Question 4

Is duct cleaning really necessary?

Accepted Answer

Duct cleaning is worthwhile in specific situations: after construction or renovation, if you've had a rodent or mold problem in the ducts, or if you can see significant dust and debris buildup inside the registers. For routine maintenance, changing your filter regularly and keeping your system clean matters more than periodic duct cleaning. We'll be straight with you — if your ducts don't need cleaning, we'll tell you.

Question 5

What type of air filter should I use for my HVAC system?

Accepted Answer

For most residential systems, we recommend a MERV 8–11 pleated filter — it catches dust, pollen, and pet dander without restricting airflow too much. MERV 13+ filters are great for air quality but can reduce airflow in systems not designed for them, causing the evaporator coil to freeze. If you want higher filtration, talk to us about whether your system can handle it or if a whole-house air purifier is a better fit.

Question 6

What do MERV ratings mean for air filters?

Accepted Answer

MERV (Minimum Efficiency Reporting Value) measures how well a filter captures particles. MERV 1–4 catches only large debris. MERV 8 catches dust, pollen, and mold spores. MERV 11 adds pet dander and smog. MERV 13+ catches bacteria and some viruses but requires a system designed for the extra resistance. Higher isn't always better — if the filter is too restrictive for your system, it causes more harm than good.

Question 7

Why is my house so humid even with the AC running?

Accepted Answer

Your AC dehumidifies as a byproduct of cooling, but if the system is oversized, it cools the air too quickly and shuts off before it can remove enough moisture. Short run times mean poor dehumidification. Other causes include a fan set to 'ON' instead of 'AUTO,' a dirty evaporator coil, or leaky ductwork pulling humid crawlspace air into the system. Western NC's summer humidity makes this a common complaint in our service area.

Question 8

Do I need a whole-house dehumidifier?

Accepted Answer

If your home stays above 55–60% relative humidity even with the AC running, a whole-house dehumidifier is the best solution. It installs inline with your duct system and removes moisture independently of whether the AC is running. This is particularly valuable in WNC where spring and fall bring high humidity without high temperatures — your AC won't run much, but the dampness can still cause mold, musty odors, and dust mite problems.

Question 9

Do UV lights in HVAC systems actually work?

Accepted Answer

Yes — UV-C germicidal lights installed near the evaporator coil kill mold, bacteria, and viruses that would otherwise grow on the wet coil surface. They're especially effective at preventing the biofilm that causes that musty smell when your AC kicks on. We recommend coil-sterilization UV lights over air-sterilization types because the exposure time on air passing through is too short to kill most pathogens at residential airflow speeds.

Question 10

What kind of air purifier works best with my HVAC system?

Accepted Answer

Whole-house air purifiers that install in the ductwork are far more effective than portable units. Media-based purifiers (like the Honeywell F100) offer excellent filtration with low maintenance. Electronic air cleaners (like the Trane CleanEffects) capture ultrafine particles but need regular cleaning. For maximum protection, we recommend pairing a high-quality media filter with a UV light — that combination handles particles, biologicals, and odors.

Question 11

Can my HVAC system help with allergies?

Accepted Answer

Absolutely — your HVAC system filters all the air in your home multiple times a day. Upgrading to a MERV 11–13 filter, adding a whole-house air purifier, sealing duct leaks that pull in unfiltered air, and keeping the system well-maintained can dramatically reduce allergens like pollen, dust mites, pet dander, and mold spores. Many of our customers in the Asheville area notice a significant improvement in allergy symptoms after upgrading their filtration.

Question 12

How does mold get into HVAC systems?

Accepted Answer

Mold thrives in dark, damp environments — and your evaporator coil, drain pan, and ductwork provide exactly that. When condensation sits on a dirty coil or in a clogged drain pan, mold colonies form and then get distributed through your home every time the blower runs. Leaky ductwork in humid crawlspaces is another major mold entry point. Regular maintenance, UV lights, and proper drainage are the best defenses.

Question 13

Can my HVAC system cause carbon monoxide poisoning?

Accepted Answer

Gas furnaces and boilers can produce carbon monoxide if the heat exchanger is cracked, the flue is blocked, or combustion is incomplete due to improper gas pressure or a dirty burner. This is why annual furnace inspections are so critical — we check the heat exchanger for cracks and test combustion gases every time. Every home with gas appliances should have CO detectors on every level, and we strongly recommend replacing them every 5–7 years.

Question 14

Where should I place carbon monoxide detectors in my home?

Accepted Answer

Install CO detectors on every level of your home, in hallways near bedrooms, and within 15 feet of any gas-burning appliance (furnace, water heater, gas fireplace). Mount them at outlet height or follow the manufacturer's instructions — CO mixes with air, so placement height matters less than proximity to sleeping areas and gas appliances. If a CO detector goes off, evacuate immediately, call 911, and do not re-enter until cleared by the fire department.

Question 15

What is an air quality test and do I need one?

Accepted Answer

An air quality test measures levels of particulate matter, humidity, CO, CO2, volatile organic compounds (VOCs), and sometimes mold spores in your home's air. It's worth doing if you're experiencing unexplained respiratory issues, persistent musty odors, or visible mold. In WNC's humid climate, elevated humidity and mold are the most common findings — both of which we can address with dehumidification and improved ventilation.

Question 16

What causes dry air in my home during winter?

Accepted Answer

Winter air in Western NC is naturally dry, and heating it further drops the relative humidity — often below 30% indoors, which causes dry skin, static electricity, cracked woodwork, and increased susceptibility to respiratory illness. A whole-house humidifier installed on your duct system adds controlled moisture to maintain 35–45% relative humidity throughout your home. It's a simple add-on that makes a big difference in winter comfort.

Question 17

How can I reduce dust in my home through my HVAC system?

Accepted Answer

Start with a good-quality pleated filter (MERV 8–11) and change it regularly. Seal duct leaks — especially at connections and in the crawlspace — because every gap sucks in unfiltered dusty air. Make sure your return vents aren't blocked by furniture. Running the fan on 'ON' for short periods can help circulate and filter air, but a whole-house air purifier is the most effective upgrade if dust is a persistent issue in your home.

Question 18

What should I do if my carbon monoxide detector goes off?

Accepted Answer

Evacuate everyone — including pets — from the house immediately and call 911 from outside. Do not re-enter the home until the fire department or gas company has tested the air and cleared it. Carbon monoxide is odorless and colorless and can be fatal. Once cleared, we'll inspect your furnace heat exchanger, flue pipe, and all gas appliances to identify and fix the source of the CO leak.

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