Proxihouse Resource Guide

The Homeowner's Complete HVAC Guide

Real cost estimates for AC replacement, furnace repair, ductwork, and tune-ups — plus how to hire a certified technician and keep your system running year-round.

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HVAC Cost Estimates

Prices vary by region, system size, and home configuration. These ranges reflect typical US market rates as of 2026 - use them as a benchmark when comparing quotes.

AC unit replacement (central, 2–3 ton)

$3,800 – $7,500

Furnace replacement (gas)

$2,500 – $6,000

Heat pump installation

$4,500 – $9,000

Ductwork repair or sealing

$300 – $1,200

Full ductwork replacement

$2,000 – $6,000

Seasonal tune-up / maintenance visit

$80 – $200

Refrigerant recharge (per pound)

$100 – $350

Thermostat replacement (smart)

$150 – $500

* Estimates are for budgeting purposes only. Always get written quotes from licensed contractors for your specific project.

How to Hire an HVAC Contractor

HVAC work involves refrigerants, gas lines, and electrical systems. The right credentials aren't optional — they're legally required.

Verify NATE certification

North American Technician Excellence (NATE) certification is the industry gold standard. Certified techs have passed rigorous exams on installation and service — always ask for proof.

Confirm EPA 608 certification

Any technician handling refrigerants is legally required to hold an EPA Section 608 certification. Unlicensed refrigerant handling is a federal violation — verify before work begins.

Get a load calculation, not just a size match

A properly sized system requires a Manual J load calculation based on your home's square footage, insulation, and climate. A contractor who quotes by square footage alone is cutting corners.

Ask about manufacturer partnerships

Factory-authorized dealers for brands like Carrier, Trane, or Lennox can register extended warranties on your behalf — sometimes adding 5–10 years beyond the standard coverage.

Request itemised quotes

A quote should break out equipment cost, labor, permits, and disposal separately. Bundled lump-sum quotes make it impossible to compare contractors fairly.

Check for permit requirements

Most jurisdictions require a permit for HVAC replacement. A contractor who skips the permit is leaving you exposed — unpermitted work can void your homeowner's insurance and complicate a future sale.

Red Flags to Watch For

HVAC scams spike in summer and winter when homeowners are desperate for a fix. These warning signs should stop any negotiation immediately.

Diagnosis fee waived only if you book the repair on the spot
Refuses to provide a written quote before starting work
Recommends full system replacement without a second opinion
Claims refrigerant is "leaking everywhere" without showing you a leak test
No EPA 608 certification for refrigerant work
Pressure to sign a maintenance contract before completing the repair
No physical business address or local references
Quote dramatically lower than all other bids

Seasonal Maintenance Checklist

A well-maintained HVAC system lasts 15–20 years. These quarterly checks take under 30 minutes and can prevent thousands in emergency repair bills.

Spring (AC prep)

Replace air filter (1-inch filters: monthly; 4-inch media filters: every 6–12 months)
Clear debris from around the outdoor condenser unit — maintain 2 ft clearance
Schedule a professional AC tune-up before peak cooling season
Test thermostat in cooling mode and check for accurate temperature reading

Summer

Check condensate drain line for clogs — pour a cup of diluted bleach to prevent algae
Monitor energy bills for sudden spikes that may signal refrigerant loss or failing components
Keep vents unblocked by furniture and rugs

Autumn (Heating prep)

Replace air filter before heating season begins
Schedule a professional furnace or heat pump tune-up
Test carbon monoxide detectors — replace batteries if needed
Inspect flue pipes and vents for blockages, rust, or disconnected sections

Winter

Keep outdoor heat pump unit clear of snow and ice — never cover it completely
Check that registers are open and unobstructed in all rooms
Monitor for unusual noises (banging, squealing) that indicate a failing component
Keep indoor temperature above 55°F even when away to protect pipes and equipment

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