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Enhance Your Home with HVAC Services in Baltimore County

You deserve a home that feels just right, no matter the season. At Diagnostic Heating and Air Conditioning, we have been serving the community with HVAC services for over 12 years, ensuring your home stays comfortable all year round. Our team specializes in residential HVAC installations, replacements, and custom ductwork in Randallstown, Ellicott City, Owings Mills and surrounding areas. Curious about our process? We handle everything from free estimates to final inspections, including permits and tailored maintenance plans. Imagine the peace of mind knowing your HVAC needs are covered by licensed and insured professionals.

We partner with top brands like Goodman, Lennox, and Carrier to ensure you receive the best performance and long-lasting comfort. Whether you're considering a ductless mini split or a complete system replacement, we deliver efficient solutions with a personal touch. Our competitive pricing and commitment to quality workmanship set us apart.

Contact us today to schedule your free estimate and take the first step towards a more comfortable home.

Commitment to Excellence and Comfort

Trust in our 12 years of experience

We service and install trusted brands like Goodman, Lennox, and Carrier, offering:

And because indoor air quality is just as important during winter, we can also install air purifiers and whole-home humidifiers to help you breathe easier while keeping your air comfortable and clean.

Stay Warm and Safe This Winter with Our Expert Heating Services

As temperatures drop across Baltimore County, your comfort depends on a reliable heating system you can trust. At Diagnostic Heating & Air Conditioning, we’re ready to keep your home cozy from Ellicott City to Towson—and everywhere in between, including Randallstown, Pikesville, Reisterstown, and Owings Mills.

With over 12 years of licensed HVAC experience, our team specializes in furnace repair, heat pump installation, and complete heating system replacements. Whether your unit struggles to keep up, makes unusual noises, or your energy bills are climbing, our skilled technicians provide fast, accurate solutions to restore comfort and efficiency.



What Sets Us Apart

At Diagnostic Heating and Air Conditioning, we pride ourselves on our commitment to the community. Our team values the trust and relationships we've built over the years. With the ever-changing weather, we understand the importance of a reliable HVAC system. Our approach combines quality workmanship with competitive pricing, ensuring you get the best value without compromising on service.

Our licensed and insured team is dedicated to providing same-day installations and long-term solutions. We believe in building lasting relationships with our clients, offering tailored maintenance plans to keep your system running smoothly year-round.

Reach out to us and discover how we can enhance your home comfort today.

Our Most Popular Services

Our heating and cooling services are designed to meet the diverse needs of local residents. We focus exclusively on residential projects, ensuring you receive specialized attention. From new installations to system replacements, we have you covered. Our team is skilled in handling various HVAC needs, including ductless mini splits and custom ductwork. Here’s what we offer:

• Residential HVAC Installation
• HVAC System Replacement
• Ductless Mini Split Installation
• Custom Ductwork & Maintenance Plans
• 24/7 Emergency Service

Schedule your service today and feel the difference in your home’s comfort.

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