(301) 843-6674
Keep Your Home or Business Comfortable Year-Round

Since 1988, homeowners and business owners have trusted Alliance Heating and Cooling Inc. for professional HVAC solutions that keep you comfortable in any season.

What our customers are saying

See why our customers are so happy with our products and services. Read their testimonials and join our community of satisfied customers.

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Your Trusted HVAC Contractor in Mechanicsville, MD, and The Surrounding Areas

Alliance Heating and Cooling Inc. has been the trusted choice for heating and cooling services since 1988. From expert HVAC repairs to residential and commercial HVAC installations, we deliver top-notch solutions tailored to your needs. Our HVAC maintenance packages ensure year-round system efficiency and protect you from unexpected breakdowns, all while prioritizing your comfort and satisfaction.

Our Services Include:

A damaged cable with burnt insulation showing exposed sections, surrounded by grass and foliage. A tool and shoe are partially visible nearby.

HVAC Repairs

Alliance Heating and Cooling Inc. provides HVAC repairs for all units, prioritizing maintenance and safety to resolve issues with sensors, motors, airflow, and refrigerant leaks.

Three outdoor air conditioning units, part of a recent heating installation, are placed beside a brick building, surrounded by fallen leaves on the grass.

Heating Installation

Alliance Heating and Cooling Inc. provides expert heating installations, specializing in heat pumps, furnaces, and mini split systems to ensure comfort and efficiency.

A hand holds a dirty air filter labeled 14x20x1 near a garden area.

HVAC Preventative Maintenance

Alliance Heating and Cooling Inc. offers biannual HVAC preventative maintenance with 20-point inspections, including spring (April-June) and fall (October-December) checks to ensure year-round efficiency.

A narrow crawl space under a house with exposed wooden beams, ducts, and plastic sheeting on the ground. An orange cable runs near the ceiling.

Duct Cleaning

Alliance Heating and Cooling Inc. provides residential duct cleaning, dryer vent cleaning, duct sterilization, high-efficiency air filters, and custom in-house ductwork fabrication, installation, and repairs.

An expertly done AC installation features an outdoor air conditioning unit next to the siding of a house, surrounded by lush grass and a blooming tree in the background.

AC Installation

Alliance Heating and Cooling Inc. specializes in AC installation, mini-split system installations, and multi-zone ductless units, utilizing brands like Bosch, American Standard, and Mitsubishi.

Rooftop with multiple large air conditioning units connected by visible piping, surrounded by urban buildings in the background.

Commercial HVAC

Alliance Heating and Cooling Inc. provides commercial HVAC services for heat pumps, ACs, furnaces, boilers, mini splits, VRF systems, air purifiers, and rooftop units.

Locations Served

Mechanicsville, MD:

Living in Mechanicsville, MD, means experiencing a mix of seasonal climates, from humid summers to chilly winters. With over 20 years of proven expertise, we understand these demands and provide tailored HVAC solutions that keep your systems running efficiently year-round. Whether preventive maintenance, system repairs, or new installations, our trusted team ensures comfort and energy efficiency regardless of the season.

Waldorf, MD:

Residents and businesses in Waldorf, MD, value transparency and dependability, which is why they trust us. Our commitment to offering free estimates and clear, upfront pricing ensures you’re always in the know. Whether you need a repair, AC installation, or seasonal check-up, we provide honest, high-quality service you can confidently rely on—all while customizing solutions to meet your needs.

California, MD:

The California, MD, community has come to value our integrity and trustworthy service. We take the time to assess your HVAC needs carefully, providing honest recommendations without pushing unnecessary add-ons. From maintaining older systems to installing energy-efficient upgrades, we prioritize your comfort and budget while delivering exceptional results that last.

La Plata, MD:

Customers in La Plata, MD, return to us repeatedly for one simple reason—we consistently deliver excellence. From flawless installations to thorough, detail-oriented repairs, we focus on ensuring your HVAC systems run smoothly and efficiently. Our commitment to high standards and unmatched customer care means La Plata homeowners and businesses can rest easy knowing their comfort is in expert hands.

Hollywood, MD:

Hollywood, MD, families, and businesses often face unique HVAC challenges, from aging systems to demanding new installations. That’s where we excel. Our skilled technicians approach every job precisely, using their expertise to optimize energy efficiency and ensure lasting performance. Whether tuning up a system or fitting a multi-zone mini-split, we provide personalized solutions to bring you year-round comfort.

Brandywine, MD:

We’ve earned a reputation for integrity and quality in Brandywine, MD, by building strong relationships and consistently delivering exceptional results. From reliable repairs to seamless installations, our team is dedicated to providing HVAC solutions backed by comprehensive warranties and a customer-first approach. Brandywine homeowners and businesses know they can depend on us to keep their air clean, their systems efficient, and their spaces comfortable year-round.

A digital thermometer showing 95.9°F rests on a metal vent cover with a geometric pattern, placed on a wooden surface.

Keeping You Cozy During the Winter Months

At Alliance Heating and Cooling Inc., we take pride in our extensive expertise in heating systems. Our team prioritizes heating preventative maintenance, ensuring your system is fine-tuned and ready to keep you comfortable throughout the season. We specialize in servicing and installing various systems, including heat pumps, gas furnaces, oil furnaces, oil-fired boilers, gas boilers, and mini split systems. Whether you're a homeowner or a business owner, we're dedicated to providing reliable solutions that meet your needs and deliver consistent comfort all season long.

Keeping You Cool in the Summer 

At Alliance Heating and Cooling Inc., we provide expert cooling solutions, offering reliable AC installation and servicing for home AC units to keep your space comfortable. As a trusted HVAC contractor, we prioritize quality with our preferred brands, Bosch and American Standard, for replacements. Our team specializes in installing and repairing mini-split systems, including advanced multi-zone ductless units that can cool up to six areas from a single system. While Mitsubishi is our go-to brand for ductless systems, we’re also skilled in handling various leading air conditioner brands to meet your needs.

Thermostat displaying heat pump status: cooling off, indoor air flow 671 CFM, outdoor coil 67°F, outdoor temp 95°F, blower RPM 0, leaving air temp N/A, lockout time 0, line voltage 238.

Why Choose Us?

Job Quality & Expertise

With over 60 years of combined, hands-on experience and 36 years in business, our skilled HVAC technicians are prepared to address even the most challenging repairs and installations. We are dedicated to delivering exceptional craftsmanship you can rely on, ensuring your HVAC system operates smoothly and efficiently—every time.

Transparency

We believe in clear communication and offer free estimates and upfront pricing. From start to finish, you’ll understand the work and costs involved—no hidden fees, no surprises.

Honesty & Integrity

Your comfort and satisfaction are our top priorities. We stand by the quality of our work and make honest, expert recommendations tailored to your unique needs, never leading you astray or cutting corners.

Warranty

We back our work with comprehensive warranties for your peace of mind. We offer 30-day labor coverage for service repairs and a 1-year labor warranty on all new installations. Our commitment to quality continues even after the job is done.

Looking for dependable HVAC services to keep your home or business comfortable year-round?

Alliance Heating and Cooling Inc. is here to help! With over 20 years of expertise, trusted brands, and a commitment to top-quality service, we’re your go-to HVAC contractor for installations, repairs, and maintenance. Contact us today for a free estimate and experience the difference of personalized, reliable comfort solutions.

Contact Information

Address: 28799 Three Notch Road, Mechanicsville MD 20659

Phone: (301) 843-6674

Business Hours:

Monday - Friday: 7am - 3pm
Sat-Sun: Closed

Areas Served

  • Waldorf, MD
  • California, MD
  • La Plata, MD
  • Hollywood, MD
  • Brandywine, MD
  • Leonardtown, MD
  • Lusby, MD
  • Prince Frederick, MD
  • Mechanicsville, MD
© 2025 
Alliance Heating and Cooling Inc.