When a heating system stops in the middle of a cold stretch, or a central air system gives out during a humid July, the question is simple: who picks up, and how soon can someone be at the property. We handle that call for Lexington homeowners, for landlords managing rental units, and for small commercial spaces that cannot afford to lose a comfortable environment for the people inside. The work covers everything from a single repair to a full system replacement, and the scope and rate are confirmed before anything is scheduled.
Lexington carries the kind of housing stock common across Middlesex County: older homes built before forced-air systems were standard, additions that were never properly served by the original equipment, and a mix of hydronic and ducted systems that each need a different approach. We work on all of it.
Call (339) 329-9392 to get a quote, and reach us every day from 8:30 AM to 9:30 PM.
Swapping in the same equipment that came out is the easiest path, but it is not always the right one. A furnace or air handler sized for the original floor plan may be undersized for a property that has been extended, or oversized for one where the attic has since been insulated and the load has dropped.
An oversized system short-cycles. It reaches temperature quickly, shuts off, and never runs long enough to pull humidity out of the air or distribute heat evenly. An undersized one runs almost continuously and still falls short on the coldest or hottest days. Neither condition shows up in the equipment model number. It shows up in how the building actually feels.
When a replacement is on the table, we size it to the property as it is now, not as it was when the original unit went in. That conversation starts on the call, and the scope of what the installation involves is laid out before anything is booked.
A large share of older homes in this part of Middlesex County still run on hot-water or steam boilers feeding baseboard radiators or cast-iron units. When a zone stops heating, or a boiler loses pressure and shuts down on a safety, the diagnosis involves more than swapping a part. Pressure checks, zone valve operation, circulator pump condition, and heat exchanger integrity are all part of the visit. A boiler that has been running for decades may be fundamentally sound but need a component that is hard to source. We work through what the repair involves before quoting anything.
The Northeast holds the overwhelming share of oil-heated homes in the country, and many properties in this area still run on oil-fired equipment. When that equipment reaches the end of its useful life, the replacement conversation often turns toward gas or a cold-climate heat pump. We handle the equipment side of that transition: removing the existing unit, installing the replacement, and confirming the system communicates correctly with the thermostat before the visit closes. The gas line and any electrical circuit or disconnect belong to their respective trades. We scope and install the heating unit itself.
A room that was added without ductwork, a finished basement, or a detached structure that needs year-round conditioning are all situations where running new duct is impractical. A ductless mini-split places an air handler in the space and connects it to an outdoor unit through a small exterior penetration. Each zone runs independently, which means a room that has always run outside the rest of the house can be brought into balance without affecting the system serving the main living area. Mini-splits provide both heating and cooling, so the installation covers both seasons.
A system that runs for long stretches without reaching the set temperature is not just an energy problem. It is usually a sign that something is working against it: a refrigerant charge that is off, a coil that needs cleaning, ductwork losing conditioned air before it reaches the room, or a unit that was never correctly sized for the load. Energy-bill concerns are treated as a diagnostic clue on every visit, because a system running harder than it should almost always has a reason.
A furnace that starts and then shuts off before the house reaches temperature, or one that attempts to ignite and fails, often comes down to the ignition system or the flame sensor. A dirty or failing flame sensor reads no flame and shuts the burner down as a safety measure, even when combustion is happening correctly. Igniter failure is a separate path with a similar symptom. Both are diagnosable on the visit, and both are common enough in older equipment that they are among the first things checked when a furnace is not completing a heat cycle.
A restricted or dirty evaporator coil reduces the system's ability to transfer heat, drives up energy use, and can cause the coil to ice over and block airflow entirely. Central air systems that blow air but fail to cool the space, or that produce noticeably less airflow than they used to, are often pointing to a coil condition. Cleaning and restoring airflow is part of the diagnostic visit when the symptoms call for it.
The rate for a visit is confirmed on the call. What the visit covers, what the diagnostic involves, and what a repair or replacement is expected to cost based on what has been described are all part of that conversation. The repair or install scope is priced before the work starts.
What moves a quote is straightforward. The fault itself matters: a flame sensor swap is a different conversation from a heat exchanger that needs inspection before anyone can say whether the furnace is worth keeping. Access matters too. Equipment in a tight crawlspace or an attic with limited clearance takes longer to reach and work on safely. And whether a repair or a replacement is the better answer changes the scope entirely. A heating unit that has been repaired repeatedly may cost more to maintain than a replacement would over the next few years. That is the kind of calculation worth going through on the call before anything is committed.
A heating or cooling fault is easier to explain than most people expect. Call with a description of what the system is doing, and we will go through what the visit should cover and what it will cost before it is booked.
A forced-air system moves air through the building continuously, and what it carries with it matters. A properly specified filter reduces the particulate load circulating through the system, which affects both the air quality in the living space and the condition of the coil and blower over time. We install whole-home filtration systems that work within the existing air handler rather than relying on portable units that cover one room at a time.
Running a furnace through a New England winter pulls moisture out of the air. Low indoor humidity makes a space feel colder than it is, affects woodwork and flooring, and can irritate the respiratory system. A whole-home humidifier integrated into the forced-air system addresses that condition at the source rather than room by room. On the cooling side, a system that short-cycles or is oversized for the space leaves humidity behind because it does not run long enough to wring it out of the air. Sizing and humidity control are connected, and we take both into account. You will find the rest of it on the heating and cooling services page.
Older properties present a specific set of HVAC challenges that newer construction generally does not. Equipment that is no longer manufactured means parts may be unavailable or sourced from shrinking supply. Ductwork that was sized for the original floor plan may not serve an addition that was built decades later. Controls wired for older equipment may not communicate with a modern thermostat without additional work.
We come across all of these in the Lexington area. When a property has been added to over time, the heating and cooling system often reflects that history: a boiler on one side of the house, a split system serving the addition, and a room somewhere that neither quite reaches. The diagnostic visit accounts for the whole picture, not just the unit that stopped working. Sometimes the right answer is a targeted repair. Sometimes it is a ductless unit for the room that was never properly served. The visit determines which conversation is worth having.
We take calls every day from 8:30 AM to 9:30 PM, including weekends. Short-notice calls are part of what we handle, and a property with no heat or no cooling gets treated as the priority it is. Emergency calls are answered during our hours, and the scope and rate are confirmed before the visit is booked.
For tenants in a rental or a business that has to stay open, we work around the access and scheduling constraints the property requires. The technician who comes out knows what the visit covers before arriving, because that is settled on the call. Planned maintenance, seasonal tune-ups, and non-urgent repairs can typically be booked a few days out, with more flexibility earlier in the season before demand peaks.
We'll go through what the service covers before it is booked.
We serve Lexington and the communities around it throughout Middlesex County. If your property is in any of the following towns, the process is the same as calling from Lexington:
If you are not sure whether we cover your address, ask on the call.
An addition that was built after the original system was installed often was not accounted for in the original duct layout or equipment sizing. The result is a space that runs outside the rest of the house regardless of what the thermostat is set to. Depending on the layout, the fix may be duct extension and rebalancing, or a ductless mini-split that conditions the space independently. We scope which approach fits the property on the diagnostic visit before anything is quoted.
Call and describe the properties and what needs doing at each one. If the addresses are close together and the work can be scheduled back to back, we will do our best to arrange it that way. It is worth asking when you call rather than booking each property separately.
A squeal during operation usually comes from a belt-drive blower that is slipping or worn, or from a motor bearing that is starting to fail. Older equipment is more likely to have belt-driven components. Catching a failing bearing before it seizes avoids a more involved repair.
Older properties in this part of Middlesex County frequently run on hot-water or steam boilers feeding baseboard or cast-iron radiators, sometimes alongside a separate split system serving a later addition. We work on hydronic systems, forced-air furnaces, heat pumps, and ductless mini-splits. If a property has a mix of these, the diagnostic visit accounts for the whole setup rather than just the unit that stopped working.
Often yes. Describing the symptom, when it happens, how long it has been going on, and whether anything changed before it started all help us scope the visit more precisely. The call is the right time to go through that detail, not after the visit is already booked.
Sometimes. If the equipment is functional and the repair cost is reasonable relative to the remaining useful life, continuing to run it is a defensible choice. We will give you a straight read on the condition during the diagnostic visit so you can make that call with the actual information in front of you.
Call (339) 329-9392 and describe what the system is doing.
We are available every day from 8:30 AM to 9:30 PM. The scope of the visit and the rate are confirmed before anything is scheduled, and short-notice calls are taken when the calendar has room. A property with no heating or no cooling is the call we move on first.
See our complete town list. Also close at hand: Arlington, Waltham, Stoneham, Lowell.
Below is a plain-language look at the heating and cooling work we handle for homes and businesses in Lexington and across Middlesex County. Each row covers what the service involves, who it fits best, and one practical thing worth knowing before you call. If a job does not fit neatly into one category, describe what the system is doing and we will figure out the right starting point together.
| Service | What's Included | Common Needs | Helpful Details |
|---|---|---|---|
| Full System Installation & ReplacementMost Popular | Load calculation for the spaceDuctwork condition reviewEquipment selection and sizingThermostat communication confirmed before sign-off | Homeowners and property managers replacing aging equipment or upgrading from an undersized system | An oversized system short-cycles and leaves humidity behind. An undersized one runs constantly and still falls short on the coldest days. Sizing is the first conversation |
| AC Repair & Service | Diagnostic of cooling failure or short-cyclingCapacitor, contactor, and blower checksRefrigerant circuit inspectionSupply air temperature confirmation | Homes or businesses with a central AC that is not cooling, cycling oddly, or running constantly | Uneven temperatures between rooms and rising energy bills are worth mentioning on the call because they help narrow the diagnosis before the visit |
| Thermostat & Smart-Control Installation | Low-voltage wiring checkThermostat-to-system communication testSchedule and zone programmingCompatibility confirmed before installation | Anyone upgrading from a manual thermostat or replacing a unit that is losing its schedule or misreading temperature | We work on the low-voltage control wiring side of the thermostat, not the household electrical system |
Every property and every system is a little different. Call us at (339) 329-9392 and we will go through what the work involves and what it costs before anything is scheduled.
(339) 329-9392