How long does HVAC installation take?

System replacement (like-for-like): 4–8 hours. Installation with ductwork modifications: 1–2 days. New construction or full duct installation: 2–5 days. Permitting adds 1–5 business days in most jurisdictions.

Do I need a permit for HVAC installation?

Yes — virtually all US jurisdictions require a mechanical permit and inspection. A contractor who skips the permit is a red flag: unpermitted work can void warranties, create insurance issues, and cause problems at home sale.

How do I compare HVAC installation quotes?

Compare: equipment brand and model with AHRI-certified ratings, sizing documentation from Manual J, ductwork scope, permit included, warranty terms, and timeline. Lowest price rarely means best value.

Should I replace both AC and furnace at the same time?

If both are 10+ years old and the AC needs replacement, replacing both together often makes sense: shared labor, matched system performance, and manufacturer warranties may require matched equipment.

HVAC System Installation — Find Trusted HVAC Services Professionals

What Is HVAC System Installation?

New HVAC installation requires proper sizing, load calculation, ductwork evaluation, and commissioning to deliver reliable comfort and efficiency.

The Importance of Proper Sizing

An oversized AC short-cycles without removing humidity. An undersized system runs constantly. Proper sizing requires Manual J load calculation using your home's square footage, insulation, window area, climate, and orientation. Any contractor sizing by square footage alone is cutting corners.

System Types

Central split system: standard for most homes with ductwork. Package unit: all components outdoor, common in South/Southwest. Mini-split ductless: ideal for additions and older homes without ductwork. Heat pump vs. gas: depends on climate, gas prices, and electrification goals.

Ductwork Inspection

Replacing equipment without inspecting ductwork is a common error. Leaky ducts waste 20–30% of conditioned air. Ask for duct leakage test results after installation. Undersized ducts create high static pressure that damages equipment.

Efficiency and Tax Credits

Systems meeting SEER2 16+ may qualify for the federal 25C Energy Efficient Home Improvement Credit — 30% of cost up to $600 for AC, $600 for furnace. Confirm eligibility with your contractor and tax advisor.

What to Look for in a HVAC Provider

State HVAC contractor license (required in most states) and EPA 608 certification for refrigerant handling
NATE (North American Technician Excellence) certification — the industry's highest technical standard
Experience with your specific equipment brand (ask about their top manufacturer relationships)
Transparent flat-rate or hourly pricing disclosed before the technician arrives
Manufacturer-authorized for warranty repairs on your brand
Maintenance plan options that include priority emergency scheduling

Professional HVAC System Installation