HVAC Services in Merrimack, NH
Trusted HVAC Services for Homes and Businesses in Merrimack.
Custom Climates installs and services heating and cooling systems throughout Merrimack, NH — Mitsubishi cold-climate heat pumps, dual-fuel systems, ducted air handlers, furnaces, and central air. Free quotes, financing options, and 24/7 emergency service.
Recent completed work in Merrimack includes a three-zone ductless system, a ducted heat pump paired with a new natural-gas furnace, and indoor-unit upgrades — from the neighborhoods along the Merrimack River to the homes tucked off Route 101A, every system is sized to the building.
Call (603) 262-1623 or request a free quote online — we answer 24/7 for emergencies.
Residential HVAC Services in Merrimack
We help homeowners in Merrimack maintain comfortable, efficient homes year-round with services that include:
Heat Pump Installation & Repair
Energy-efficient heating and cooling designed for New Hampshire weather
Ductless Mini Split Systems
Zoned comfort solutions for targeted temperature control and lower energy use
Air Conditioning Installation & Service
Reliable cooling systems built for summer humidity and best performance
Furnace Installation & Repair
Dependable heating systems for long, cold winters
Boiler Service & Hydronic Heating
Installation, repair, and maintenance for hot water and radiant heating systems
Ventilation & Indoor Air Quality Solutions
ERVs, HRVs, filtration, and humidity control for healthier indoor air
Commercial HVAC Services in Merrimack
We install, service, and maintain heating and cooling systems for Merrimack businesses, property managers, and facility operators — offices, retail, and light commercial buildings. From system assessments and replacements to preventative maintenance contracts, we keep equipment running through peak season.
See our full commercial service overview or call (603) 262-1623 to talk through your building.
Commercial HVAC Solutions in Merrimack
We work with businesses, property managers, and facility operators throughout Merrimack to deliver dependable, commercial-grade HVAC solutions:
Commercial Heating & Cooling Systems
Installation and service for offices, retail, and light commercial buildings
Commercial Heat Pump Systems
Energy-efficient options for lower operating costs
Zoned & Multi-Area HVAC Designs
Solutions for buildings with varying comfort demands
Preventative Maintenance Contracts
Scheduled service plans focused on uptime and reliability
Emergency HVAC Repair
Responsive service for critical system failures
System Assessments & Upgrades
Evaluation and replacement of aging equipment to improve efficiency and performance
Why Property Owners in Merrimack Choose Custom Climates
Merrimack homeowners keep calling us for straightforward reasons — honest recommendations, systems sized to the building, and technicians who show up when scheduled.
We also serve nearby Derry and Salem, plus 60+ towns across Southern New Hampshire.
Heating and Cooling in Merrimack: Ductless, Dual-Fuel, and Ducted
Merrimack’s housing stock runs from 1970s colonials to newer developments, and no single system fits them all. We install Mitsubishi cold-climate heat pumps — built to keep heating at outdoor temperatures as low as −13°F — as ductless multi-zone systems, ducted air handlers, and dual-fuel setups that pair a heat pump with a gas furnace for the coldest stretches. We also service and replace furnaces and boilers.
Comparing options? See financing options for larger installs.
Recent Heating & Cooling Projects in Merrimack
Three completed jobs logged in Merrimack this year — ductless, dual-fuel, and an indoor-unit upgrade:
Three-Zone Ductless Mitsubishi Heat Pump — Merrimack (June 2026)
One Mitsubishi outdoor condenser feeding three indoor units — the master bedroom and two additional bedrooms — giving the homeowners room-by-room heating and cooling without ductwork.
Ducted Heat Pump with New Gas Furnace — Dual-Fuel — Merrimack (spring 2026)
A ducted Mitsubishi heat pump — indoor air handler plus outdoor condenser — installed alongside a new natural-gas furnace: heat-pump efficiency most of the season, furnace backup for the coldest stretches, all delivered through new insulated ductwork.
Indoor-Unit Upgrade — Merrimack (May 2026)
Older 9,000-BTU ceiling-cassette indoor units replaced with matched 6,000-BTU wall-mounted units — right-sized heads, quieter operation, better control.
Curious what a ductless or dual-fuel system would cost for your home? Request a free quote or call (603) 262-1623.
Schedule HVAC Service in Merrimack
If you’re dealing with comfort issues, rising energy costs, an aging system, or unexpected breakdowns, Custom Climates is here to help.
Call us for service or emergency assistance.
Request a consultation
Ask about maintenance plans for year-round reliability
Inquire about commercial service contracts and preventative maintenance. We look forward to helping you maintain reliable, efficient comfort in Merrimack, NH.
