
Furnace Maintenance in Gray, Maine
Filter Replacement · Safety Inspection · Efficiency Check
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Furnace Maintenance for Gray Homeowners

For furnace maintenance in Gray, homeowners turn to Aces Highlands: a Portland-based crew (508 Riverside St Unit 1) that is minutes from Cumberland County and already familiar with the homes, climate and codes here.
Regular furnace maintenance is the best way to prevent unexpected breakdowns and keep your heating bills in check. Aces Highlands provides thorough annual tune-ups that keep your furnace running safely and efficiently.
Our furnace maintenance service includes filter replacement, burner cleaning and inspection, heat exchanger inspection, safety control testing, blower motor lubrication, thermostat calibration, and a complete combustion analysis.
A cracked heat exchanger is one of the most serious furnace safety issues — it can allow carbon monoxide to enter your living space. Our maintenance inspection includes a careful check for this and all other safety concerns. We also recommend having your boiler maintained at the same time if your home has both systems.
Schedule your furnace tune-up in early fall before the heating season. Catching small issues early prevents mid-winter breakdowns and keeps your system running at peak efficiency all season long. Contact us to book your annual tune-up.
Why Gray Calls Aces Highlands
- We run trucks through Gray and the rest of Cumberland County routinely, not occasionally
- We tell you what is actually wrong and what it costs, plainly, every time
- Most requests land a visit within days, not the following month
- Fully licensed, fully insured, with a track record of Google reviews from real jobs
Gray Homes and What They Need
Gray's roughly 4,600 homes are younger than much of Cumberland County. Census estimates put the median year built at 1983, and only about one in eight predates 1940. Those older houses cluster around Gray Village and along the old roads out toward Dry Mills. The bigger story is the building wave of the 1970s through the 2000s, when capes, ranches and colonials went up on wooded lots within reach of Turnpike exit 63; about a quarter of homes date from 2000 or later. Roughly one in twenty is a manufactured home, and around 670 units are held for seasonal use, many of them camps on Little Sebago, Crystal and Forest lakes. Houses from the 1980s and 1990s are now reaching the age where original boilers, furnaces and electrical panels with no spare breaker space come due, while a lakeside camp raises questions about insulation and year-round use.
Heating and Cooling in Gray
Heating oil still dominates in Gray. Census estimates show about six in ten occupied homes heat mainly with fuel oil or kerosene, roughly 18 percent with propane, 12 percent with electricity and nearly 8 percent with wood, while utility gas barely registers at under 1 percent. Natural gas mains effectively do not reach the town, so propane is the fallback wherever a gas range or boiler is wanted. Gray is inland and snowy: its climate record shows January averaging in the low 20s Fahrenheit and around 84 inches of snow a year, and the National Weather Service office that forecasts for western Maine and New Hampshire sits on Weather Lane in Gray. For an oil-heated house, a cold-climate heat pump installation can carry most of the winter load while the existing boiler or furnace stays as backup for the coldest nights, and the same equipment handles summer cooling.

Getting to Know Gray
Gray holds one of Maine's most unusual Civil War stories: in 1862, the body of an unknown Confederate soldier was mistakenly shipped to Gray instead of a fallen local Union lieutenant. The women of the town buried the stranger in Gray Village Cemetery and paid for his headstone — marked simply "The Stranger" — and the grave is still tended today. Gray is also home to the Maine Wildlife Park, the state's refuge for animals that cannot return to the wild.
From the village center out to Dry Mills, Gray's homes range from 1800s farmhouses to newer builds off Route 26 — and we service heating, plumbing, and electrical in all of them.
Local & Independent — Not a Franchise
Aces Highlands is independently owned and based in greater Portland, with no franchise territory map dictating how Gray gets treated. Our techs are paid to do the job right, not to upsell — no commission structure pushes them toward extra work. Earning the next call, not hitting a sales target, is the entire business plan.
How a Furnace Works
- Return air — pulled in through the filter
- Blower — pushes air across the heat exchanger
- Burners — ignite to heat the exchanger
- Heat exchanger — transfers heat without mixing combustion gases
- Supply air — warm air delivered to the home
Homeowner Guide
Annual Furnace Maintenance: The Real Checklist
Furnace maintenance is the most commonly skipped HVAC service, largely because a furnace can run for years with no visible sign it's overdue — until the one cold morning it doesn't.
Read the Full GuideMore Furnace Repair & Installation
Furnace Maintenance is part of our full furnace repair & installation lineup. Explore the details or browse everything we offer in Gray.
Furnace Maintenance DetailsAll Services in GrayService Info
Codes & Permits for Furnace Maintenance in Gray
In Gray, plumbing permits come from the Local Plumbing Inspector at the Gray Code Enforcement Office (Henry Pennell Municipal Complex, 24 Main Street, Gray, ME 04039, (207) 657-3339). With 8,269 residents, Gray is required to enforce the Maine Uniform Building and Energy Code (MUBEC). Gray includes frontage on Little Sebago Lake, Crystal Lake and Forest Lake and is drained by Collyer Brook — all relevant to well/septic siting and shoreland zoning outside the water district's service area.
- Oil-fired furnaces fall under the same Maine Fuel Board Oil Burner Technician licensing (Apprentice/Journeyman/Master) as oil boilers. maine.gov
- Installing, repairing, or servicing a propane or natural gas furnace requires a Maine Fuel Board Propane and Natural Gas Technician license, with separate authorizations depending on BTU size and scope of work. mainelegislature.org
- Propane and natural gas equipment and dispensing installations in Maine must comply with NFPA 54 (National Fuel Gas Code) and NFPA 58 (Liquefied Petroleum Gas Code). maine.gov
How Aces Highlands Handles Furnace Maintenance in Gray
- Where Unitil serves the street in Gray, gas equipment is usually the simplest furnace maintenance option; elsewhere we quote oil, propane and heat-pump alternatives side by side.
- About 53% of Gray homes heat with heating oil today. Oil equipment is installed to NFPA 31, gas and propane to NFPA 54/58, and every vent or chimney tie-in to NFPA 211.
- Once a furnace maintenance is finished, we check that carbon monoxide detectors are actually present near the bedrooms — Maine law requires them in any home heated by fuel-burning equipment.
Hancock Street near the center of Gray village, close to the town's public library.
Street View © Google
Why homeowners choose Aces Highlands
We show up when we say
We show up on time, as promised, and complete the work with clean professionalism.
Pricing upfront, before work starts
Honest diagnostics and a clear price before any work begins — no surprises on the invoice.
Done right the first time
HVAC, plumbing and electrical done right the first time — backed by our workmanship guarantee and 100% satisfaction guarantee.
Locally owned in Portland, Maine · Serving Greater Portland and Southern Maine since 2019
What HVAC customers say
John Walton
5 months ago
I've had three HVAC issues over the past two years. Each time I call, Elija or the office picks up the phone, and my problem is fixed in 24 hrs. Their solutions always feel correct and honest. I cannot recommend them more.
Adam Ayan
10 months ago
Elijah and Highlands Heating & AC were super helpful! Boiler failed over the weekend and Elijah was very responsive and helpful, getting us up and running right away. I would recommend him at HH&AC highly!
Justin Funk
a year ago
We highly recommend Highlands Heating & AC. They are extremely responsive, knowledgeable and do great work. Our boiler stopped working and Elijah was quick to respond after hours on a Friday. He installed a new boiler and heat pump hot water heater.
Tom
14 Aug 2024
He was very friendly. He gave me an honest explanation on why I shouldn't recharge my A/C unit and what he suggested made much more sense. He really took care of everything. He is very professional, always called me with updates. 5 stars is not enough — I give this company 10 stars.
Jacqueline Vogeley
2 weeks ago
Great experience! Open, honest and efficient 🙌🏽 Job well done
Susan Donegan
3 months ago
We have called Samuel for our electrical needs over the last few years and have always been impressed with professional and courteous attitude — installing extra outlets, installing new lights and ceiling fans, our whole house generator, charger for the electric car, even the hot tub!!! His price was fair, and never disappointed when work was completed.
Furnace Maintenance FAQs
How often should a furnace be serviced?
Once a year — ideally in late summer or early fall before the heating season. Oil furnaces especially should never skip a year, since soot buildup and nozzle wear steadily degrade efficiency and reliability.
How often should I change my furnace filter?
Check monthly during heating season and replace every 1–3 months depending on filter type, pets, and dust. A clogged filter is the single most common cause of furnace short-cycling and overheat shutdowns we see.
How much does a furnace tune-up cost?
Typically $150–$400 depending on fuel type, with oil furnaces toward the top because the service includes a new nozzle, oil filter, and full soot cleaning. We quote up front and run seasonal specials on our coupons page.
What happens if I skip furnace maintenance?
Efficiency drops as dirt accumulates, small failures go unnoticed until they strand you without heat, manufacturer warranty coverage can lapse, and safety issues — cracked heat exchangers, venting problems, CO — go undetected. Skipping maintenance does not save money; it defers it with interest.
Will you inspect for carbon monoxide?
Yes. Every tune-up includes a heat exchanger inspection and a combustion analysis that measures CO directly. We also recommend every home with fuel-burning equipment keep working CO detectors on each level.
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Aces Highlands handles HVAC, plumbing, and electrical for Gray homeowners. Here is more of what we do nearby.
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Tankless Water Heaters in GrayNeed Furnace Maintenance in Gray?
Call our Gray team or get a free quote. We will get you scheduled and take care of it right the first time.
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