HVAC, Plumbing & Electrical
in Merrimack, NH
A.J. LeBlanc Heating serves Merrimack and Southern NH, family-owned since 1928. Licensed technicians, honest estimates, and 24/7 emergency service.
Complete Home Services
for Merrimack Homeowners
Our licensed 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
Furnace, boiler, and heat pump installation and repair in Merrimack. Annual maintenance and 24/7 emergency response.
Heating ServicesAir Conditioning
Central A/C and ductless mini split installation and service in Merrimack. We've installed thousands of ductless systems across Southern NH.
A/C ServicesPlumbing
Water heaters, drains, fixtures, water-supply piping, and residential plumbing repairs for Merrimack homes.
Plumbing ServicesElectrical
Panel upgrades, generators, EV chargers, and electrical repair for Merrimack homeowners. Licensed NH electricians.
Electrical Services
We Know
Merrimack Homes.
Few towns in southern New Hampshire grew as fast as Merrimack. The population went from under 3,000 in 1960 to more than 22,000 by 1990. You can still read that growth in the houses. The boom years put up mostly ranches and split-levels, and many now have original heating and cooling equipment approaching replacement age.
Housing: The census puts the median year built around 1985. Most of Merrimack's homes went up in the 1970s and 1980s. About 84 percent of the housing units are single-family homes, and roughly 89 percent are owner-occupied, so there aren't many multi-family homes here. The older neighborhoods are full of ranches and split-levels, and the developments from the 1990s on lean toward colonials.
Furnaces, Boilers &
Heat Pumps
Heating in Merrimack
Merrimack still runs heavily on oil. Many homes still have furnaces or boilers that have been repaired over the years and are now approaching replacement age. Replacing that equipment is a significant part of our work in Merrimack. Natural gas runs through parts of town along the Route 3 (Daniel Webster Highway) corridor, where Liberty Utilities operates the natural gas main, so we do oil-to-gas conversions on those streets. Farther out, homes run on propane delivered to an onsite tank. On the older ranches we are steadily supplementing or replacing boiler heat with heat pumps, or installing a high-efficiency furnace. The utility rooms in these homes are tight, so we take our time getting the sizing right.
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
Most of these ranches and split-levels weren't built with central air in mind, so many have no ductwork to tie into. A mini split is usually a good fit, and it handles the additions and bonus rooms these homes tend to have. The newer colonials from the 1990s and 2000s usually came with a forced-air furnace already, so on those homes we can run central A/C through the existing ductwork.
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
Much of Merrimack is served by the Merrimack Village District, which uses groundwater wells. The district treats for iron and manganese and uses carbon filtration to reduce PFAS (per- and polyfluoroalkyl substances), a family of long-lasting chemicals. Other properties have private wells.
On district water, additional treatment should have a clear purpose at your tap, such as a taste concern or dedicated drinking-water filtration. We can provide whole-house activated carbon or an under-sink carbon or reverse osmosis system when it fits that goal. For private wells, laboratory results guide the work.
Options may include sediment filtration, iron or manganese filtration, a softener for measured hardness, whole-house ultraviolet treatment for confirmed bacteria, or arsenic treatment selected for the laboratory result. When a laboratory result confirms radon in well water, we can share 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 Village District water and private-well water can present different treatment and plumbing considerations. When discolored water affects the whole house, we trace the cause before recommending a repair. It may come from the public water supply, the service line, filtration equipment, or piping inside the home.
We also take care of the routine problems that have nothing to do with water treatment, including dripping fixtures, worn connections, failed shutoff valves, water-heater trouble, damaged interior pipes, and slow drains. The location and timing of the symptom tell us where to begin.
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.
We work all over Merrimack's four villages, from Reeds Ferry and Thorntons Ferry down to South Merrimack. Much of our work involves replacing aging oil boilers and furnaces, converting homes to natural gas where service is available, and installing mini splits in homes without ductwork. These homes are generally solid, but many have reached the age where their original equipment is due for replacement, and we help homeowners figure out what makes the most sense. A.J. LeBlanc has been family-owned since 1928.
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 HVAC technician is EPA certified and NH gas-licensed. Our plumbers and electricians are NH 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
"From the estimate to the completed installation, the salesmen and technicians explained everything involved in a thorough manner. All questions were answered expertly. The staff is very knowledgeable and professional."
"Timely and professional! Would highly recommend!"
"Good pricing, people are very professional, and willing to explain. Would definitely use A.J. LeBlanc Heating again!"
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 availability for emergencies. 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.