HVAC FAQ

HVAC technicians in Colorado charge $125-$200 per hour during business hours; emergency service runs $180-$350 per hour. Service call fees ($100-$200) include diagnosis. Common repairs: furnace ignition repair $250-$600, blower motor replacement $450-$800, thermostat replacement $150-$400, AC refrigerant leak repair and recharge $500-$1,500. Full system replacements: furnace $3,500-$7,000, central AC $3,000-$6,000, heat pump $5,000-$10,000. Get multiple quotes for major repairs.

Schedule professional HVAC maintenance twice yearly: furnace tuneup in fall (September-October), AC tuneup in spring (April-May). Costs $80-$150 per visit. Maintenance includes: filter replacement, thermostat check, electrical connections tightening, lubrication, refrigerant level check (AC), burner inspection (furnace), and safety checks. Regular maintenance extends system life 5-10 years, improves efficiency 15-20%, prevents 90% of breakdowns, and maintains warranty validity.

Use 50% rule: If repair costs more than 50% of replacement cost AND system is past 75% of expected lifespan, replace. Example: $1,800 repair on 18-year-old furnace (expected life 15-20 years) = replace. $600 repair on 10-year-old AC = repair. Age guidelines: furnaces 15-20 years, central AC 12-15 years, heat pumps 10-15 years. Other replacement indicators: efficiency below 80% AFUE (furnaces) or 13 SEER (AC), refrigerant is R-22 (obsolete, expensive), frequent repairs (3+ repairs in 2 years).

Frozen AC coils indicate restricted airflow or refrigerant issues. Turn off system immediately (continued operation damages compressor). Common causes: (1) Dirty air filter (check monthly, replace every 1-3 months), (2) Blocked registers or vents, (3) Dirty evaporator coil (professional cleaning $100-$200), (4) Low refrigerant from leak (repair $500-$1,500), (5) Blower fan failure, (6) Closed dampers. After turning off, let ice melt (4-6 hours), check filter, then restart. If freezes again, call HVAC tech within 24 hours.

HVAC sizing requires professional heat load calculation (Manual J). Factors: square footage, insulation, windows, ceiling height, climate, orientation. Colorado homes typically need: 1,500-2,000 sq ft = 2-3 tons AC / 60,000-80,000 BTU furnace; 2,000-2,500 sq ft = 3-4 tons AC / 80,000-100,000 BTU furnace. Oversized systems short-cycle (inefficient, uncomfortable), undersized systems run constantly (wear out faster). Never size by square footage alone—insulation and altitude matter. Get 3 load calculations from different contractors.

SEER (Seasonal Energy Efficiency Ratio) measures AC efficiency. Higher = more efficient. Minimum legal SEER in Colorado: 14 SEER (as of 2023). Standard: 14-16 SEER. High efficiency: 17-21 SEER. Each SEER point above 14 saves ~7% on cooling costs. AFUE (Annual Fuel Utilization Efficiency) measures furnace efficiency. 80% AFUE = 80% of fuel converts to heat, 20% lost through exhaust. Standard: 80% AFUE. High efficiency: 90-98% AFUE. High-efficiency furnaces cost $1,500-$3,000 more but save $200-$400 annually in Colorado winters.

Furnace noises and causes: (1) Rumbling or boom at startup = delayed ignition (dirty burners, gas pressure issue—needs service), (2) Squealing or screeching = blower motor bearings failing (replace $450-$800), (3) Banging or popping = expanding/contracting ductwork (normal if brief; constant = undersized ducts), (4) Rattling = loose panels or failing motor mount, (5) High-pitched whistling = airflow restriction (check filter). Rumbling and delayed ignition can indicate cracked heat exchanger (carbon monoxide risk—shut down immediately, call HVAC).

Yes, Colorado's dry climate (25-35% humidity average) benefits from whole-home humidifiers. Ideal indoor humidity: 35-45% in winter. Benefits: fewer respiratory issues, less static electricity, protects wood floors/furniture, feels warmer (can lower thermostat 2-3°F and save 5-10% on heating). Options: bypass humidifiers ($300-$600 installed), fan-powered humidifiers ($500-$800), steam humidifiers ($800-$1,200). Maintenance: clean monthly, replace pad annually. Over-humidification causes condensation on windows—sign to reduce output.

Heat pumps transfer heat instead of generating it—efficient but struggle below 25°F. Colorado heat pump suitability depends on location: Denver/Boulder metro (mild winters, 10-20 days below 20°F) = good candidate with backup heat. Mountain areas (long, cold winters) = not recommended without backup. Modern cold-climate heat pumps work to 5°F. Cost: $5,000-$10,000 installed. Benefits: heats and cools, 300-400% efficiency (vs. 80-95% furnace), lower carbon footprint. Drawbacks: higher upfront cost, needs backup heat, 10-15 year lifespan (shorter than furnaces).

10 ways to reduce HVAC costs: (1) Smart thermostat ($150-$300, saves 10-23% annually), (2) Replace filters monthly, (3) Seal duct leaks (30% of conditioned air lost in average home), (4) Add attic insulation (R-38 to R-60 in Colorado), (5) Window treatments (cellular shades reduce heat loss 40%), (6) Programmable schedule (68°F when home, 62°F when away in winter), (7) Ceiling fans (counterclockwise in summer, clockwise in winter), (8) Annual HVAC maintenance, (9) Seal air leaks around doors/windows, (10) Upgrade to high-efficiency system (14+ SEER AC, 90%+ AFUE furnace).

Before calling HVAC: (1) Check thermostat (set to HEAT, temperature above current temp, has working batteries), (2) Check circuit breaker hasn't tripped, (3) Check furnace power switch near unit (looks like light switch), (4) Check air filter (clogged filter causes safety shutdown), (5) Check for standing water near furnace (condensate drain clog trips safety). If these don't fix it, call HVAC. Winter emergencies (no heat, below 20°F outside): call emergency service immediately. Use space heaters safely while waiting (never on extension cords, 3 feet clearance, never unattended).

No. Modern HVAC systems are balanced for specific airflow. Closing vents: (1) Doesn't save energy (system produces same amount of conditioned air), (2) Creates pressure imbalances, (3) Reduces efficiency (system works harder against increased resistance), (4) Can damage ductwork, (5) Causes hot/cold spots. Better solutions: zone system with dampers ($1,500-$3,500), mini-split for problem areas, or smart thermostat with room sensors. Close vents only if HVAC tech includes it in zone-system design.

Uneven temperatures result from: (1) Inadequate insulation (attic should be R-38 to R-60 in Colorado), (2) Air leaks around windows/doors, (3) Ductwork leaks or poor design (30% air loss in average home), (4) Wrong-size HVAC system, (5) Closed or blocked vents, (6) Single-zone system in multi-story home. Solutions: duct sealing ($500-$1,500), additional insulation ($1,500-$3,000), zone system with dampers ($1,500-$3,500), or mini-split for problem rooms ($2,000-$4,000 per zone). Start with duct sealing and insulation—cheapest, biggest impact.

No. AC units are designed for outdoor exposure year-round. Full covers trap moisture, causing rust and mold, and provide nesting spots for rodents. If concerned about debris, use a cover that protects only the top (leaves, hail) and allows sides to breathe. Remove any covers before running AC in spring. Better winter prep: turn off dedicated AC circuit breaker (prevents accidental operation), clear debris from around unit, and schedule spring tuneup before cooling season.