HVAC Pricing
GSMS has served New Hampshire homeowners and businesses since 1987. What started with Mark Downing working out of a single truck is now a second-generation, family-owned company run by his sons Zak and Jack. We are 100% locally owned and operated, so when you call, you reach the people who actually stand behind the work.
the GSMS difference
Specialists, not technicians
We send Specialists, not technicians. Each one takes ownership of your whole system, not just the part that broke.
The Great Service promise
Affordable pricing, 5-star service, and pride in our work. If you’re not satisfied, we’ll make it right. It’s how we’ve worked since 1987.
The independent alternative
While large out-of-state firms buy up local shops, GSMS stays family-owned and answers to our neighbors, not a board of directors.
Built on our values
Every visit is guided by four values: grateful daily, service comes first, make it matter, and success is teamwork.
what's included in every job
No matter the size of the job, every GSMS visit meets the same standard of care. This is the quality built into every price below.
A GSMS Specialist backed up with over 40 years of experience (we’re pro’s at unique problems) We stand behind our craftsmanship with a 3-year warranty on installation projects and a 2-year warranty on other work (1 year for those who aren't Home Club members). Installations left level, clean, and code-correct We use genuine OEM parts and materials to uphold our craftsmanship (supporting USA Made when possible). Upfront pricing confirmed in writing before work begins Before our departure, we verify that all systems are functioning flawlessly and address any remaining inquiries you may have. Your home is treated with the same care we give our own Supporting a Second-Generation family business to power the local economy instead of corporate.
how our pricing works
Every home and system is a little different, so we publish honest ranges instead of a single number that rarely fits. Your job lands within the range based on the details in the right column. A GSMS Specialist confirms your exact price in writing before any work begins, so there are no surprises.
Furnace installation
New high-efficiency gas, propane, or oil furnace, fully installed.
Furnace repair
Diagnosis and repair of an existing furnace.
Furnace maintenance
Annual tune-up and safety inspection.
Boiler installation
New boiler for hot water (hydronic) heating.
Energy Kinetics System 2000
High-efficiency boiler with integrated hot water.
Central AC installation
New central air conditioning system, fully installed.
Air conditioner repair
Diagnosis and repair of an existing AC system.
AC maintenance
Annual cooling tune-up and inspection.
Mini-split heat pump installation
Ductless heating and cooling for one or more rooms.
Mitsubishi ductless system
Premium ductless comfort from a Diamond contractor.
Ductless mini-split replacement
Swap of an aging or failed ductless system.
Smart thermostat installation
ecobee smart thermostat, installed and set up.
Whole-home air purifier
Healthy Climate purification is built into your system.
Indoor air quality (humidifiers and more)
Whole-home humidity and air-balance solutions.
Ready to get started?
Furnace repair
AC repair
Heat pump repair
Thermostat or control board issue
Deluxe Home Club
Heating system maintenance visit Air or plumbing maintenance visit 10% off all repairs, no diagnostic fees 1st-in-line priority scheduling $10 monthly reward credit 2 year labor warranty
Premier Home Club
Heating, AC, and plumbing maintenance 10% off all repairs, no diagnostic fees 1st-in-line priority scheduling $10 monthly reward credit 2 year labor warranty Top-tier coverage for maximum protection
already a Home Club member?
Skip the guesswork. Give us a call or request service online, and we’ll come to your home for a free price check, no diagnostic fee, no surprises. That’s the Home Club difference.
