Comfort Air saved the day. Lost my furnace on a very cold December day. Called many HVAC companies but none could see me for days. Patrick came to the house the same day. We settled on a replacement system and his team installed the next day. And just in time. It was only 13 degrees that night. It was a totally professional experience from start to finish.
Premium HVAC Services for Southern New Hampshire
Since 2011, Comfort Air Services has served Southern New Hampshire homeowners with HVAC repairs, installations, and maintenance. We’re veteran-owned, provide personalized guidance, and offer financing options.
Heating and Cooling Services in Southern NH
Our team handles repairs, replacements, ductless mini-splits, indoor air quality, and maintenance across Derry, Fremont, Portsmouth, and the New Hampshire Seacoast. Homeowners call us for same-day scheduling, 24/7 availability, and clear repair-versus-replace advice.

Air Conditioning and Heat Pump Services
Restore cooling, plan your replacement, or install a system built for humid Southern New Hampshire summers.

Boiler Repair and Replacement
Get boiler repair, replacement planning, and installation before winter strains aging equipment.

Furnace Repair and Installation
Call our Fremont team for furnace repair, replacement, and installation when your home needs dependable heat.

Ductless Mini Split Installation
Add comfort to additions, older homes, and hard-to-condition rooms without major ductwork changes.

Indoor Air Quality Services
Address stale air, dust, uneven comfort, and airflow issues that leave rooms uncomfortable.
Why Homeowners Choose Comfort Air
Veteran-Owned and Local
You work with a Fremont company built around dependable service for Southern New Hampshire.
Licensed NH Gas Fitters
Comfort Air Services requires NH Gas Fitter licensing and works under Mechanical Business Entity
MBE2501718.Honest Repair and Replacement Guidance
We inspect the system, explain the options, and help you compare repair and replacement costs.
Emergency Service Available
Our office runs from 8 AM to 5 PM, and our technicians take emergency calls when urgent problems hit.

Comfort Club Maintenance Plans
Comfort Club helps you keep your HVAC system on schedule with seasonal maintenance in spring and fall. Our technicians tune the system, check for wear, improve efficiency, and catch small issues before they cause breakdowns.
Members receive priority scheduling, repair discounts, and monthly payment options that keep routine maintenance in the household budget.
We maintain systems for homeowners, rental properties, condo associations, and business offices across Southern New Hampshire.
Flexible Financing Through Foundation Finance
Comfort Air Services partners with Foundation Finance Company to help you plan HVAC upgrades without delaying needed work.
Ask us about installment loans and same-as-cash programs, subject to credit approval. Our team walks you through the process, helps you review available options, and lets you choose what fits your home.

Comfort Shield Protection for Long-Term System Care
Comfort Shield adds labor coverage to your new HVAC system warranty. Manufacturers cover warrantied parts. Comfort Shield covers the labor to repair or replace those parts, which helps you avoid surprise repair bills.
The plan follows your manufacturer warranty terms unless the agreement notes an exception, so you know what coverage applies before you need service.
Comfort Shield requires Comfort Club membership. Annual maintenance keeps your system cared for and helps protect your long-term investment.
- 90%
of System Failures Involve Missed Maintenance
- 50%
of a Home's Energy Bill Can Go to Heating and Cooling
- 5-10 Yrs
of Extra System Life From Preventive Maintenance
Reviews from Southern NH Customers
Schedule Service or Request an Estimate
Contact our Fremont team for repairs, replacements, maintenance, or guidance on the next step for your home comfort system.
Common Heating and Cooling Questions
1. Do you handle both repair and installation?
Yes. Comfort Air Services provides heating and cooling service, installation, replacement planning, and preventative maintenance.
2. What areas do you serve?
We serve Southern New Hampshire, including Fremont and nearby communities such as Northwood, Newington, Seabrook, Salem, Windham, and Manchester.
3. Do you offer emergency help?
Yes. The office is open from 8 AM to 5 PM, and technicians are on call for emergencies when fast help is needed.
4. Why does maintenance matter?
Missed maintenance leads to many HVAC failures, and neglected systems can lose efficiency year after year.
5. Do you work with homeowners and businesses?
Yes. Comfort Air Services works with homeowners and local businesses.
Get HVAC Tips, Maintenance Reminders, and Special Offers
Join the Comfort Air Services email list for practical heating and cooling advice, seasonal service reminders, and occasional promotions for homeowners across Southern New Hampshire.



