What we do

Whole-home heating, cooling, and air quality.

One Boulder shop. Every HVAC service under one roof — repair, install, maintain. Written quotes before any work begins, NATE-certified techs on every visit.

  • Hearthstone technician servicing an AC system on a Boulder-area call.

    AC repair & installation

    Diagnose, repair, or replace AC systems and heat pumps from Lennox, Trane, Mitsubishi, Bosch, and Carrier. We service every major brand made in the last 30 years.

    • Flat $89 diagnostic on every call (waived when you approve the repair)
    • Written, line-by-line quote before any work begins
    • Refrigerant leak detection with EPA-certified handling
    • Heat-pump installations including cold-climate models for Boulder winters
    • Manufacturer warranty registration handled on your behalf

    Repairs typically $189–$680 · New AC installs $5,800–$11,200

    Request a quote
  • Installer mounting a heating radiator beside a sunlit living-room window.

    Furnace & boiler service

    Furnace repair, replacement, and combustion safety. Boiler service for older Boulder homes. Carbon-monoxide test on every heating-system visit, every time.

    • Carbon-monoxide test on every heating call (free, never an add-on)
    • Combustion analysis with calibrated equipment
    • Heat exchanger inspection with photo documentation
    • Hot-water and steam boiler service for pre-1980 Boulder homes
    • High-efficiency furnace installs with rebate paperwork filed for you

    Repairs typically $220–$850 · New furnace installs $4,900–$9,800

    Request a quote
  • A Hearthstone tech inspecting and cleaning an HVAC filter on a home visit.

    Indoor air quality

    MERV-13+ filtration, UV-C purification, whole-home humidifiers, and ERV/HRV systems. Built around Boulder's specific challenges — dry winters, wildfire-smoke summers, high-elevation dust.

    • MERV-13 filtration retrofits for existing furnaces and AC systems
    • UV-C lamps for coil and duct sanitization
    • Whole-home steam humidifiers (sized to your home, not generic)
    • Heat- and energy-recovery ventilators for tight modern builds
    • Pre-wildfire-season filter tune-up — book by July

    Filter upgrades $320–$680 · Whole-home IAQ systems $1,400–$3,800

    Request a quote
  • Hands and a wrench working on pipes in a residential utility space.

    Tune-ups & maintenance plans

    Spring AC tune-ups, fall furnace tune-ups, and the HearthGuard membership for everything in between. The maintenance you actually want before you need a service call.

    • Spring AC tune-up: refrigerant check, coil clean, capacitor test
    • Fall furnace tune-up: combustion analysis, heat-exchanger inspection, blower clean
    • HearthGuard membership: $19–$59/mo (single system → multi-system)
    • Members get 24/7 priority dispatch and 15% off all repairs
    • No after-hours surcharges, ever — same flat rate at 9pm Sunday as 9am Tuesday

    Tune-ups $129 each or bundled in HearthGuard from $19/mo

    Request a quote
Brands we install & service

Top-tier HVAC, installed right.

We install the brands we trust on our own homes. We service every major brand from the last 30 years — even the ones we don't install — so you're covered whatever's already on your slab.

  • Lennox
  • Trane
  • Mitsubishi
  • Bosch
  • Carrier
  • Goodman
  • Rheem
  • York
  • American Standard

Don't see your brand? We service every major HVAC make from the last 30 years — call us.

Get in touch

Call us. Or leave a number — one of our team members will call you back within the hour.

Marcus, Elena, or Priya picks up — no call centers. Tell us what's going on, and we'll set expectations on the phone before any truck rolls.

Call (303) 555-0142

Mon–Fri 7am–7pm · Sat 8am–5pm
24/7 emergency line · same flat rate

Call (303) 555-0142Request call-back