Frequently Asked Questions

How does a UV light inside my HVAC vent actually kill bacteria and mold?

UV-C light damages the DNA of microorganisms passing through it, preventing them from reproducing. Great Dane installs the lamp inside your vent so air gets sanitized every cycle - think of it as a tollbooth your air can't sneak past, neutralizing 99.9% of contaminants.

Why does my furnace keep running constantly and never shut off?

Usually it's a thermostat that's miscalibrated, a clogged filter choking airflow, or a faulty limit switch. Your furnace is essentially "chasing" a temperature it can't reach. At Great Dane, we diagnose whether it's a control issue, airflow restriction, or heat exchange problem.

What's the difference between a MERV 13 filter and a charcoal filter?

MERV 13 is rated for trapping fine particles like pollen, mold spores, and bacteria - it's a physical sieve. Charcoal filters use activated carbon to absorb odors and gases instead, like a sponge for smells. Many homes benefit from layering both depending on air quality concerns.

Why do I need flexible R8 ducts instead of just patching my old ones?

The "R8" rating means R-value 8 insulation, which dramatically reduces conditioned air loss as it travels through hot attics. Patching leaky, uninsulated ducts is like bandaging a leaky garden hose - flexible R8 ducts seal and insulate the whole pathway, improving system efficiency.

How does professional duct cleaning actually work?

We use the BrushBeast DR from Rotobrush, which combines a rotating brush with dual-vacuum suction. The brush agitates dust, pollen, and mold off duct walls while the vacuum captures it simultaneously - similar to how a carpet cleaner scrubs and extracts in one pass rather than just blowing debris around.

When should I get an HVAC tune-up versus waiting for something to break?

Tune-ups catch failing capacitors, weak igniters, and cracked heat exchangers before they strand you on a 105° Bakersfield afternoon. Great Dane's $80 service inspects airflow, gas pressure, motors, and pilot lights - preventive care that's far cheaper than emergency repairs and component replacements.

What factors affect the cost of replacing my ductwork?

Home square footage, the length and routing of new runs, attic accessibility, the number of registers, and whether you're upgrading to insulated R8 flex duct all influence pricing. Damaged or undersized existing ducts may also require resizing to properly match your HVAC system's airflow.

Why is my AC running but not actually cooling the house?

Common culprits include a refrigerant leak, a failing capacitor that prevents the compressor from starting, a frozen evaporator coil, or major duct leaks dumping cold air into your attic. Our experience at Great Dane shows that diagnosis matters - guessing on parts wastes money.

How does a Nest smart thermostat save money compared to my old one?

Nest learns your schedule and auto-adjusts when you're asleep or away, instead of conditioning an empty house at full blast. It's like cruise control for your HVAC - small efficiency gains every hour add up to noticeable bill reductions, especially during Bakersfield's long cooling season.

How long does a new ductwork installation take?

Most residential duct replacements wrap up within a couple of days, depending on home size, attic accessibility, and how much existing material needs removal. Older homes with tight crawlspaces or asbestos-era materials take longer because each section requires careful handling before new flex duct goes in.

Can a really old HVAC unit be saved, or do I just have to replace it?

Often yes - Great Dane refurbishes units rather than defaulting to full replacement. Refurbishment means rebuilding worn components (motors, capacitors, contactors) and is like restoring a car engine versus buying a new vehicle. Once heat exchangers crack or compressors fail, replacement becomes the smarter investment.

Why does dirty ductwork affect my allergies more than just the air outside?

Your ducts recirculate the same air dozens of times daily, concentrating dust, pollen, dander, and mold spores that settle on duct walls. Each cycle redistributes those particles directly into your breathing space - it's like drinking from the same glass for months without washing it.