HVAC, Plumbing & Electrical in Merrimack, NH

A river town that learned what is in the ground matters

Merrimack sits in southern New Hampshire's growth corridor, straddling the Everett Turnpike between Nashua and Manchester, with the Souhegan River cutting west to east across town before it spills into the Merrimack River along the eastern edge. It grew from four old ferry villages into ranches, colonials, and 1970s and 80s subdivisions, with newer builds filling in around the Anheuser-Busch plant and Route 3. It is a comfortable place to own a home, and it is also the New Hampshire town that learned, in a very public way, that what is in the water and the ground beneath a house matters as much as anything inside it. Servicing a home here starts with that lesson.

PFAS is local history, not a hypothetical

In 2016, PFAS from the Saint-Gobain Performance Plastics plant off Route 3 turned up in Merrimack's groundwater. The plant had made fluoropolymer-coated fabrics since the 1980s, and airborne PFOA settled into the soil and wells for more than a mile and a half around the site. More than 600 private wells and the Merrimack Village District public supply were affected, and Saint-Gobain funded point-of-entry treatment systems, granular activated carbon on the district wells, and water-line extensions to hundreds of properties. If you own a home in Merrimack, well water and filtration are not a hypothetical here - they are recent, documented history. We test your water against that reality, design filtration to the actual results, and retest to prove the system is doing its job, rather than selling you a generic cartridge that was never rated to remove PFAS in the first place.

Well water carries more than the headline

The Saint-Gobain story put PFAS on everyone's mind, but New Hampshire's granite bedrock loads private wells with problems that never make the news. Roughly a quarter of the state's private wells run arsenic above New Hampshire's 5 parts-per-billion standard, and the USGS estimates 55 percent of the state sits over groundwater more likely than not to carry elevated radon, on top of the hardness, iron, and manganese common across the region. Left alone, arsenic and radon are invisible health risks, and hard water quietly scales up your water heater and fixtures until efficiency drops and the tank fails early. We run the full panel instead of the single headline test, then build the treatment train the results call for - PFAS media, arsenic and radon reduction, and softening where hardness is doing the damage - and put the water heater behind it so the whole system lasts longer.

Real winters mean heating has to be sized right

Merrimack is inland, so there is no salt air wearing out equipment - the enemy here is cold. Winters drop into the single digits and below, and a lot of those 1970s and 80s subdivisions are still running first-generation central systems that are undersized, worn, or both. An oversized or failing system either can't hold temperature on the coldest nights or short-cycles its way to an early grave and a high bill. We start with a real heat-loss calculation instead of a guess, then right-size the replacement. For many Merrimack homes a cold-climate heat pump is the efficient answer, heating and cooling from one system with backup heat sized for a hard January snap, so you are covered when the temperature actually bottoms out.

Humid summers and the basements that feel it

The flip side of a New Hampshire winter is a humid summer, and inland humidity settles into finished basements and lower levels where it turns clammy and, left unchecked, grows mold. An oversized air conditioner makes this worse, not better - it cools the air fast, shuts off before it pulls the moisture out, and leaves the house damp. Sizing is the whole game. We size cooling to a genuine load calculation and set up proper dehumidification so the house feels dry at a comfortable temperature, and because we are inland, your outdoor unit gets to reach the age it should on maintenance alone, without the coastal corrosion that eats equipment near the shore.

Older pipe, cold snaps, and the freeze that follows

Plenty of Merrimack homes still carry the galvanized steel and cast iron common to houses of their age, and that pipe corrodes from the inside until pressure drops and leaks start. Add a January cold snap and any line run through an unheated crawlspace, garage wall, or slab is a freeze waiting to happen, and a frozen pipe that splits does its damage the day it thaws. We repipe the worn runs, protect or reroute the lines most likely to freeze before the cold arrives, and keep the water heater on treated water so scale is not shortening its life in the background.

Panels, EV chargers, and the storm that takes the power

The same subdivisions with aging heat also tend to have panels that were never meant to carry central air, an EV charger, and a finished basement all at once, so breakers trip and the service runs at its limit. We upgrade to 200-amp service and add circuits cleanly, to code, with the permit pulled. The bigger issue is winter outages, which on this stretch of New Hampshire can last well past a day. When the power goes, so does the heat, and so does the pump on a private well - no electricity, no water. A whole-home standby generator keeps the heat, the well pump, the sump, and the refrigerator running through the storm, starting on its own and shutting down when the utility comes back. In a town that already knows what a water problem feels like, that is not a luxury.

One team instead of five

The water treatment, the heating and cooling, the repipe, the panel, and the generator are one licensed, veteran-owned team dispatched from our Manchester branch just up Route 3 - not five contractors to chase and coordinate. Same-day where we can get to you, permits pulled, and a lifetime workmanship guarantee behind all of it. In a town that already learned to take its water seriously, one accountable team is the way to keep a house running.

What we get called for in Merrimack

The work that comes up most around here. Same team, same guarantee, whichever one you need.

• Water Treatment - Cleaner, safer water for your whole home.
• Generator Install - Keep your home powered no matter what.
• Boiler Repair - Restore heat fast with reliable service.
• Heat Pumps - Repair or replace modern heat pumps.
• Furnace Repair - Restore heat fast with reliable service.
• Panel Upgrades - Boost home power and improve safety.
• Oil-to-Gas Conversion - Upgrade your home to use modern, efficient fuel.
• Water Heaters - Repair or replace tank and tankless units.

Worth reading before you call us in Merrimack

Our own research, sourced and dated, on the problems that come up around here.

• Microplastics: What We Know and What We Do NotMicroplastics are in tap water, bottled water, food, air, and human blood and placental tissue. The WHO says current levels do not appear to pose a health risk. Both of those statements are true. Here is how to hold them at the same time.
• Pesticides in Your Drinking Water: The Atrazine ProblemAtrazine has been banned in the European Union since 2004. It is still one of the most heavily used herbicides in America and one of the most frequently detected pesticides in drinking water. The federal limit was set decades ago.
• Hormones and Pharmaceuticals In Your Drinking WaterEvery prescription filled in your town eventually reaches the watershed. The concentrations are tiny, nobody is required to test for them, and the fish downstream are telling us something. Here is what the evidence supports and what it does not.
• BPA, Phthalates and Endocrine DisruptorsBPA shows up in over 90% of Americans tested. The BPA-free replacements look like they behave the same way. These compounds are not on any drinking water report, and conventional treatment does not remove them.

We also serve near Merrimack

Same team, same guarantee, a short drive away. Find your town for the local details.

• Litchfield, NH
• Bedford, NH
• Londonderry, NH
• Amherst, NH
• Nashua, NH
• Hudson, NH