Heating & Cooling Solutions for Year-Round Comfort
Trethewey Brothers has been keeping Boston homes warm in the winter and cool in the summer for over 125 years. Whether you’re dealing with a boiler breakdown, planning an energy-efficient upgrade, or exploring ductless options, our expert technicians are ready to help.
From installation and repairs to long-term maintenance, we handle a full range of heating and cooling systems—boilers, furnaces, heat pumps, central AC, mini-splits, water heaters, and more. We also design and install ductwork to make sure your system delivers comfort to every room.
Our Heating & Cooling Services
Explore our wide range of professional heating & cooling services. Tap a service to learn more or schedule a visit.
Hvac Installation, Service & Replacement
Whether you need a brand-new system or your current setup needs attention, our team handles full HVAC installation, service, and replacement for homes across the Boston area. We'll assess your space, recommend the right equipment, and make sure everything runs smoothly from day one. If your system is aging or underperforming, we'll walk you through your options so you can make the best choice for your home and budget.
Boilers
Keep your home warm and efficient with expert boiler services. Whether it’s a repair, replacement, or brand-new installation, we work with all major systems to ensure lasting comfort. If your boiler is outdated or showing signs of wear, we’ll help you choose the best fit for your home and energy needs.
Furnace Installation & Repair
From gas and electric to high-efficiency models, we install and repair furnaces built to handle Boston's toughest winters. If your furnace isn't keeping up, making unusual noises, or driving up your energy bills, our technicians will diagnose the issue and get things back on track. When it's time for a new unit, we'll help you choose a system that fits your home and delivers reliable warmth season after season.
Heat Pumps
Heat pumps are one of the most efficient ways to heat and cool your home. We install, repair, and maintain all types of systems—including traditional and ductless options—to deliver year-round comfort and major energy savings.
Air Conditioning Systems
Stay cool all summer with a central air conditioning system or a ductless mini-split designed for your home's layout and cooling needs. We install, service, and replace AC systems of all types, helping you find the right balance of comfort, efficiency, and value. Whether you're adding AC for the first time or upgrading an older unit, our team will make sure the job is done right.
Ductless Mini-Split
Ideal for homes without ductwork, mini-split systems provide targeted, whisper-quiet comfort in any room. Our team handles full installation and replacements with precision and care, helping you create customizable zones while lowering energy use.
Ductwork Design, Installation & Sealing
Your heating and cooling system is only as good as the ductwork delivering the air. We design and install duct systems for new construction and retrofits, and seal existing ducts to eliminate leaks that waste energy and reduce comfort. Properly sealed and installed ductwork helps your HVAC system run more efficiently, saving you money and keeping every room at the right temperature.
Water Heaters
Don’t get left in the cold—our team installs, maintains, and replaces traditional tank and tankless water heaters. Whether yours is struggling or it’s simply time for an upgrade, we’ll help keep your hot water flowing efficiently.
Heating System Maintenance
Regular service is key to long-term system performance. We offer thorough tune-ups and inspections to catch small issues before they become big problems—saving you money and avoiding winter breakdowns.
Air Quality Solutions
Breathe easier at home with professionally installed humidifiers, dehumidifiers, and filtration systems. We customize your setup to address allergens, dry air, or moisture problems so your whole household stays healthier.
Energy-Efficient Upgrades
From thermostatic radiator valves to radiant floor heating and hydronic air elimination, we help homeowners lower energy use without sacrificing comfort. Our team recommends smart, cost-effective upgrades that work for your space.
Common Heating & Cooling Questions We Hear
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If your boiler is over 15 years old, requires frequent repairs, or isn’t heating your home efficiently, it may be time for a replacement. Rising utility bills are also a key sign that your system is working harder than it should.
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Both heat pumps and ductless mini-splits provide heating and cooling. A heat pump typically works with a central system or ducts, while a mini-split delivers zoned climate control without the need for ductwork.
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You can absolutely install a mini-split in just one room. They’re perfect for home offices, additions, and bedrooms—anywhere you want targeted comfort without upgrading your whole HVAC system.
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We recommend annual maintenance—ideally before the cold season hits. This helps catch any small issues, extend the life of your system, and keep it running at peak efficiency.
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Yes! Modern mini-splits are designed to perform well even in very low temperatures. We’ll make sure you have the right system for your home’s size and insulation level.
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Inconsistent hot water, strange noises, or signs of rust near your unit can all point to a failing water heater. If it’s 8–12 years old, it’s worth having it inspected before it gives out unexpectedly.
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You can schedule a service visit online by clicking the “Schedule a Visit” button at the top of this page, or by giving us a quick call. Our team is ready to help you find a time that works best for your schedule.
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It depends on your home's existing setup. If you already have ductwork, central AC is usually the most efficient route. If you don't (or you want to cool specific rooms) a ductless mini-split offers flexible, energy-efficient comfort without a major renovation.
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We install gas, electric, and high-efficiency furnaces from leading manufacturers. Our team will evaluate your home's heating needs and help you select a system that balances performance, efficiency, and cost.
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Uneven temperatures between rooms, higher-than-expected energy bills, and excessive dust are common signs of leaky ductwork. A professional inspection can identify problem areas and help restore your system's efficiency.