HVAC, Plumbing & Electrical
in Merrimack, NH
A.J. LeBlanc Heating serves Merrimack and Southern New Hampshire. Family-owned since 1928, our EPA-certified HVAC technicians, licensed plumbers, licensed electricians, and water-treatment specialists provide honest estimates and 24/7 emergency service.
Complete Home Services
for Merrimack Homeowners
Our in-house heating, cooling, plumbing, and electrical teams work together under one roof. Homeowners get one company to coordinate the job and one clear point of contact from start to finish.
Heating
We install, repair, and maintain furnaces, boilers, and heat pumps in Merrimack, with 24/7 emergency service available.
Heating ServicesAir Conditioning
We install and service central A/C and ductless mini split systems in Merrimack. Our team has installed thousands of ductless systems across Southern NH.
A/C ServicesPlumbing
Our licensed plumbers handle water heaters, drains, fixtures, water-supply piping, and residential plumbing repairs in Merrimack homes.
Plumbing ServicesElectrical
Our licensed New Hampshire electricians handle panel upgrades, standby generators, EV chargers, and electrical repairs for Merrimack homeowners.
Electrical Services
We Know
Merrimack Homes.
Merrimack grew from fewer than 3,000 residents in 1960 to more than 22,000 by 1990. That growth is still visible in its ranches, split-levels, later colonials, and the several generations of home systems A.J. LeBlanc Heating services throughout town.
Housing: About 84 percent of Merrimack's housing units are single-family homes, and roughly 89 percent are owner-occupied. Much of the housing was built during the 1970s and 1980s, putting the median year near 1985. Ranches and split-levels are common in those established neighborhoods, while developments from the 1990s and later include more colonials. The town's growth pattern means many homes are now evaluating replacements for original or earlier-generation heating and cooling equipment.
Furnaces, Boilers &
Heat Pumps
Heating in Merrimack
Oil heat remains common in Merrimack, particularly in the ranches and split-levels built during the town's major growth decades. Liberty Utilities operates natural gas service in parts of town along the Route 3, Daniel Webster Highway, corridor, allowing A.J. LeBlanc Heating to complete gas equipment replacements and oil-to-gas conversions where service is available. Other homes use propane or are candidates for cold-climate heat pumps. We check the home's heating needs, existing distribution system, utility-room space, and available fuel options before recommending a furnace, boiler, or heat-pump replacement.
Heating Services We Provide
We provide complete heating service in Merrimack, including installations, annual service, emergency repairs, and system replacements. When you need us, we respond quickly.
- Gas & Oil Furnace Installation
- Boiler Installation & Repair
- Heat Pump Installation
- Water Heater Replacement
- Annual Heating Maintenance
- 24/7 Emergency Heating Service
Air Conditioning &
Mini Split Installation
Cooling in Merrimack
Many of Merrimack's 1970s and 1980s ranches and split-levels were built without central air-conditioning ducts. A mini split system can add cooling to those homes and can also serve additions or bonus rooms that the original system does not reach well. Colonials built during the 1990s and 2000s often have forced-air ductwork that can carry central A/C or a ducted heat pump after we verify airflow and capacity. A.J. LeBlanc Heating evaluates the layout, ducts, airflow, and electrical capacity before designing the system.
Cooling Services We Provide
We install and service central air conditioning, heat pumps, and ductless mini splits in Merrimack. We have installed thousands of ductless systems across Southern NH. Whether you need a summer repair or a complete replacement, we respond quickly.
- Central A/C Installation
- Ductless Mini Split Systems
- Heat Pump Installation
- A/C Repair & Tune-Up
- Indoor Air Quality
Filtration, Softeners
& Testing
Water Treatment in Merrimack
The Merrimack Village District serves much of town from groundwater wells. The district treats for iron and manganese and uses carbon filtration to reduce PFAS (per- and polyfluoroalkyl substances). Other Merrimack properties use private wells.
On district water, A.J. LeBlanc Heating can provide whole-house activated carbon to improve taste or odor, or an under-sink carbon or reverse osmosis system for drinking and cooking water. For a private well, we collect samples for an independent laboratory and let the results guide treatment for sediment, iron, manganese, measured hardness, confirmed bacteria, or arsenic. If a laboratory result confirms radon in well water, we can provide contact information for an independent mitigation company.
Water Treatment Services We Provide
Merrimack homeowners can call us for water-treatment installation and service. For a private well, an independent laboratory analyzes the sample before we select and size the treatment equipment.
- Well Water Filtration
- Water Softeners
- Iron & Manganese Removal
- Reverse Osmosis Drinking Water
- UV Purification
- Water Sampling & Independent Laboratory Testing
Water Heaters, Drains
& Fixtures
Plumbing in Merrimack
Merrimack's ranches, split-levels, later colonials, and home additions contain a wide range of plumbing layouts. A.J. LeBlanc Heating repairs dripping fixtures, worn connections, failed shutoff valves, damaged interior piping, slow drains, running toilets, and water heaters that need service or replacement. For homes on private wells, we inspect and service well tanks and pressure switches.
We trace the symptom to the failed plumbing component and explain the repair without turning an everyday problem into an unnecessary larger project.
Plumbing Services We Provide
Our plumbers service fixtures, water heaters, supply piping, drains, well tanks, pressure switches, and related controls in Merrimack. We keep the work focused on what the home needs.
- Water Heater Installation
- Well Tanks, Pressure Switches & Controls
- Drain Cleaning
- Faucet & Fixture Installation
- Household Water-Supply & Drain Piping
- Repairs & Service
Panels, Generators
& EV Chargers
Electrical in Merrimack
Your heating, cooling, and electrical work can all be handled by the same trusted company in Merrimack. Our electrical team includes licensed New Hampshire electricians.
Electrical Services We Provide
We install standby generators and EV chargers and complete electrical-panel upgrades. You can expect a quick response and work that meets code.
- Electrical Panel Upgrades
- Standby Generator Installation
- EV Charger Installation
- Lighting, Outlets & Switches
- Electrical Repair & Service
Local to Merrimack.
Trusted Since 1928.
A.J. LeBlanc Heating works throughout Reeds Ferry, Thorntons Ferry, Souhegan Village, and South Merrimack. We help homeowners replace aging oil boilers and furnaces, consider a gas conversion where service is available, and add central or ductless cooling based on the home's layout. Our family-owned company has served New Hampshire since 1928, and our HVAC, plumbing, electrical, and water-treatment teams can coordinate the work when a project crosses trades.
Based in Bedford, about 15 minutes from Merrimack
Our shop is on South River Road in Bedford. We know the roads and we respond quickly.
Licensed, Insured & Background-Checked
Every A.J. LeBlanc HVAC technician holds EPA Section 608 certification and a separate New Hampshire fuel gas fitter license. Our plumbers and electricians are New Hampshire master or journeyman licensed in their trade. A.J. LeBlanc Heating is ACCA QA Certified.
Not Commission-Based
Our technicians are not paid sales commission. Their recommendations stay focused on what the home needs.
24/7 Emergency Response
No heat at 2am? We answer the phone every day of the year, including holidays.
What Southern NH
Homeowners Say
"Wonderful work whether plumbing, heating or air conditioning. Wouldn't call anyone else."
"Excellent service, fast response time, smart and pleasant techs, and good prices. I am completely happy!"
"Robert the chief HVAC technician is very knowledgeable and a superb installer - A.J. LeBlanc Heating is very accessible for routine as well as emergency issues."
HVAC, Plumbing & Water FAQ
for Merrimack, NH
Do you service Merrimack, NH?
Yes. Merrimack is one of our core service areas. We provide heating, air conditioning, plumbing, and electrical services throughout Merrimack and the surrounding Hillsborough County area. Call 603-623-0412 for a free estimate.
How quickly can you respond in Merrimack?
Our Bedford headquarters is about 15 minutes from Merrimack. We typically schedule service within 1-2 business days, with same-day appointments for emergencies when scheduling allows. For urgent heating or cooling issues, call us directly at 603-623-0412.
Do you offer emergency service in Merrimack?
Yes. We provide 24/7 emergency service in Merrimack. Call 603-623-0412 any time, day or night, including weekends and holidays.
Are there heating or cooling rebates available in Merrimack?
Merrimack homeowners may qualify for NHSaves rebates through Eversource, Liberty Utilities, New Hampshire Electric Cooperative, or Unitil. Additional New England Heat Pump Accelerator incentives may apply to qualifying equipment. Program rules and funding can change, so we confirm the current options when preparing the estimate.
Do you handle both HVAC and plumbing?
Yes. We handle heating, cooling, plumbing, and electrical all under one roof. That means one call, one relationship, and one company familiar with your whole home. No coordinating between multiple vendors or schedules.
What heating systems are common in Merrimack?
Heating systems vary from one Merrimack home to another. We service boilers, furnaces, heat pumps, and other common systems. After inspecting the home, we explain the repair or replacement options clearly.
Do I need water treatment in Merrimack?
It depends on your water source and your goals. For a private well, we collect a sample and send it to an independent laboratory. We use the results to recommend treatment only when the water calls for it. For public water, we review the utility report and investigate the condition at the tap before recommending additional equipment.
What water treatment systems do you install in Merrimack?
We install water softeners, iron and manganese filters, sediment filters, activated-carbon filters, whole-house ultraviolet systems, arsenic-treatment systems, and under-sink reverse osmosis. Equipment is selected and sized from independent laboratory results, the public-water report, and the homeowner's specific goal. For radon in well water, we can provide contact information for an independent mitigation company.
What plumbing services do you offer in Merrimack?
We handle water heaters, drain cleaning, faucet and fixture installation, leak and pipe repair, shutoff valves, and water-supply and drain piping throughout the home. If the home uses a private well, we also service the well tank, pressure switch, and related controls. We complete selected exterior piping as well, including irrigation and accessory-dwelling-unit connections.
Do you install and replace water heaters in Merrimack?
Yes. We install and replace natural gas, propane, oil, and electric water heaters, plus heat-pump water heaters. We help you choose the right size and fuel for your home and install it to code.
Also Serving Towns Near Merrimack
Get in Touch
Fill out the form and we'll get back to you. Usually the same business day. For emergencies, call us directly.
Contact Information
Mon-Fri: 8am-4:30pm
Evenings & Weekends: Emergency Service
24/7 Emergency Service
No heat? No hot water? Call 603-623-0412 any time.