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One-Year Guarantee for New Installs

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Emergency Services Available

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Specialty HVAC Services
Bayport, NY

One-Year Guarantee for New Installs

Free On-Site Estimates for New Equipment

Emergency Services Available

Request Lorem Epsom

Hero Request Form

Four Generations of Heating and Cooling Excellence Since 1937

Donlon Brothers Heating & Cooling Inc has been serving Bayport, NY and the surrounding areas since 1937. As a fourth-generation, family-owned business, we bring decades of specialized knowledge to every heating and cooling project. Our first responder-owned company combines technical precision with a commitment to quality service that larger contractors simply cannot match.

From our earliest days when oil burners first appeared on the market, Donlon Brothers Heating & Cooling Inc has stayed ahead of HVAC innovation while serving Suffolk County, NY. We are fully licensed and insured, offering emergency services when you need them most. Our small business approach means personalized attention and superior customer care. Ready to experience the difference? Contact us for a free on-site estimate.

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Why Choose Us

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One-Year Guarantee for New Installs

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Free On-Site Estimates for New Equipment

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Emergency Services Available

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Family-Owned & Operated

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Licensed & Fully Insured

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First Responder-Owned & Operated

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Why Choose Us

White checkmark inside a black circle icon

One-Year Guarantee for New Installs

White checkmark inside a black circle icon

Free On-Site Estimates for New Equipment

White checkmark inside a black circle icon

Emergency Services Available

White check mark inside a black circle icon on a white background

Service Contracts Available

White checkmark inside a black circle icon

Family-Owned & Operated

White check mark inside a black circle icon on a white background

Licensed & Fully Insured

White checkmark inside a black circle icon

First Responder-Owned & Operated

White check mark inside a black circle icon

Four Generations of Experience

Utility room with a white water heater, boiler equipment, pipes, valves, and a bucket against a concrete wall.
Furnace Inspection
Regular furnace inspections keep your heating system running safely and efficiently throughout the cold months. Our certified technicians thoroughly examine all components, identifying potential problems before they turn into costly repairs.
HVAC Inspection
Comprehensive HVAC inspections keep your entire climate control system running at peak performance. We evaluate both heating and cooling equipment to maximize energy efficiency and extend the lifespan of your investment.
Mini-Split Installation
Mini-split systems provide flexible, efficient heating and cooling solutions for any space. Our installation services guarantee your ductless system performs optimally from day one, backed by our one-year guarantee on all new installations.
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Recent Projects

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Here's what our satisfied customers are saying...

At Donlon Brothers Heating & Cooling Inc, we take pride in providing exceptional HVAC services to our customers. We would be grateful if you could share your thoughts about our HVAC company with others. Your feedback helps us improve and helps others make informed decisions. Please take a moment to leave a review of Donlon Brothers and let others know what you think.