HVAC Frequently Asked Questions
Expert answers to the most common questions about HVAC costs, maintenance, efficiency, and more.
How much does a new HVAC system cost?
A complete HVAC system (AC + furnace or heat pump) costs $5,000-$15,000 for a typical home. AC-only installation costs $3,800-$7,500, furnace replacement $2,500-$6,800, and heat pump installation $4,100-$9,200. Costs vary by system type, efficiency, home size, and location.
How long does an HVAC system last?
Central AC systems last 15-20 years, gas furnaces 15-20 years, heat pumps 15 years, boilers 20-30 years, and mini-splits 20-25 years. Regular maintenance can extend lifespan by 5-10 years. Systems in coastal areas or extreme climates may have shorter lifespans.
How often should HVAC be serviced?
HVAC systems should be professionally serviced twice per year: once for cooling in spring and once for heating in fall. Between professional visits, change filters every 1-3 months, keep the outdoor unit clean, and ensure vents are unobstructed.
What is SEER and why does it matter?
SEER (Seasonal Energy Efficiency Ratio) measures AC and heat pump cooling efficiency. Higher SEER means lower electricity costs. The federal minimum is 14-15 SEER2 depending on region. Each SEER point above minimum saves $30-$80/year. For hot climates, 18+ SEER provides the best return on investment.
Should I repair or replace my HVAC system?
Use the 5,000 Rule: multiply system age by repair cost. If over $5,000, replace. Also replace if: repairs exceed 50% of new system cost, the system uses R-22 refrigerant, you have a cracked heat exchanger, or the system is beyond its expected lifespan. For systems under 10 years with minor issues, repair is usually best.
What is the federal heat pump tax credit?
The Inflation Reduction Act provides a 30% tax credit, up to $2,000, for qualifying heat pumps installed 2023-2032. The system must meet CEE Tier efficiency requirements. Efficient AC units and furnaces qualify for up to $600. These are tax credits (not deductions), directly reducing your tax bill.
Are heat pumps worth it?
For most homeowners, yes. Heat pumps provide both heating and cooling in one system, are 2-3x more efficient than gas furnaces in moderate weather, and qualify for significant tax credits. Modern cold-climate models work well down to -15F. The strongest ROI is for homeowners replacing oil, propane, or electric resistance heating.
What is the best HVAC brand?
The top brands are Carrier (premium, invented AC), Trane (most durable), Lennox (highest efficiency), Rheem (best value), and Goodman (most affordable, Daikin-backed). The best brand for you depends on budget and priorities. Installation quality matters as much as brand - a premium brand poorly installed will underperform.
How can I lower my HVAC energy bills?
Top strategies: install a smart thermostat (saves 10-15%), seal duct leaks (saves 15-25%), improve insulation (saves 10-20%), upgrade to efficient equipment (saves 20-40%), use ceiling fans, close blinds in summer, and keep up with maintenance. Combined, these can reduce HVAC costs by 30-50%.
Do I need a permit for HVAC installation?
Yes, most HVAC installations require building permits. A reputable contractor handles the permit process. Unpermitted work can void manufacturer warranties, cause insurance claim denials, and create problems when selling your home. Never agree to skip permits.
What size HVAC system do I need?
System size depends on your home's specific heating and cooling load, determined by a Manual J calculation. A general rule is 1 ton of AC per 500-600 sq ft, but this varies significantly based on insulation, windows, climate, ceiling height, and home orientation. Always insist on a Manual J calculation rather than rules of thumb.
Is duct cleaning worth it?
Duct cleaning is worth it if you have visible mold, pest evidence, excessive dust, or post-renovation debris. For homes without specific issues, the EPA states there is no evidence that routine duct cleaning improves air quality. Beware of $99 specials - legitimate duct cleaning costs $300-$700.
What is a two-stage or variable-speed system?
Single-stage systems run at 100% capacity or off. Two-stage systems have low (60-70%) and high speeds. Variable-speed systems continuously adjust from 25-100% capacity. Higher stages provide more even temperatures, lower noise, better humidity control, and higher efficiency. They also cost more upfront.
When is the best time to buy a new HVAC system?
Spring and fall offer the best deals - contractors are less busy and may offer 10-15% discounts. Avoid emergency replacement during peak summer or winter when prices are highest and choices are limited. Start researching when your system reaches 12-15 years old so you can plan rather than react.
Need a Cost Estimate?
Use our calculator to estimate HVAC costs for your specific home and location.