Maintain Comfort with Reliable HVAC Service
Family-owned support for heating, cooling, and air quality across the Washington–Baltimore corridor.
Keep Systems Running Through Every Season
Dependable work with clear focus on function and performance
Long Engineering LLC offers commercial HVAC services, residential HVAC services, heater installation, heater repair, AC installation, AC repair, generator services, and home improvement throughout the Washington–Baltimore corridor. Properties across this region vary widely—from older housing stock in established neighborhoods to newer developments along major routes—and each demands attention to function over flash. Whether you manage a commercial building in Baltimore or own a home in Bowie, your systems need to work reliably when it matters most.
You'll find straightforward service built around what actually needs to happen: assessing your equipment, identifying issues, and addressing them without unnecessary extras. Our team moves through each job with a focus on getting things working correctly, whether you're dealing with a broken heater in winter or planning an installation before the next cooling season. Expect practical solutions that fit the realities of your space and the demands of your schedule.
Long Engineering LLC is a second-generation, family-owned company with over 30 years of hands-on industry experience. That background shapes how we approach every project—no shortcuts, no guesswork, just reliable work that holds up over time. When your heating, cooling, or air quality systems need attention, you're working with people who've been doing this long enough to know what works.
If you're anywhere in the Washington–Baltimore corridor and need HVAC or generator services, reach out to Long Engineering LLC and let's get your systems back on track.
What Happens During Service
When you schedule with us, you'll know what to expect from start to finish. We walk through the scope of work with you before we begin, confirm timelines, and keep you informed as the job progresses. Every installation, repair, or maintenance visit follows a documented approach so there are no surprises along the way. You'll understand what's being done, why it's necessary, and how long it should take.
Our process is designed to minimize disruption while maximizing results. Whether we're troubleshooting a commercial system or upgrading residential equipment, each step is planned with your property and your schedule in mind. You'll have a clear point of contact, consistent updates, and honest answers to any questions that come up during the work.
Here's what you can count on when you work with Long Engineering LLC:
Proper system design, maintenance, and airflow optimization to improve indoor air quality in homes and businesses
Hands-on experience across a wide range of heating, cooling, and generator equipment for diverse property types
Practical solutions that address both immediate problems and longer-term system performance
Dependable service across Bowie, Baltimore, and surrounding Maryland communities with mixed residential and commercial needs
Contact Long Engineering LLC to schedule service anywhere in the Washington–Baltimore corridor and get your equipment running the way it should.
Trust Second-Generation Experience for Your Systems
Over 30 years of hands-on work keeping homes and businesses running smoothly.
Built on Experience and Accountability
Long Engineering LLC has been serving homeowners and businesses along major routes connecting Washington, DC and Baltimore for decades, supporting both older housing stock and newer developments with the same level of care. Being a family-owned operation means we're accountable for every job we take on—there's no passing the responsibility to someone else. Our reputation in communities like Bowie and Baltimore is built on showing up, doing the work right, and standing behind what we deliver.
You'll work with technicians who understand the real-world demands of HVAC systems in this region and who take pride in solving problems that matter. We're not chasing trends or upselling services you don't need. Instead, we focus on the fundamentals: diagnosing issues accurately, recommending appropriate solutions, and executing installations and repairs that last. That consistency has kept us busy across the corridor for over 30 years, and it's what you'll experience from your first call through project completion.
If you need heating, cooling, generator services, or home improvement support throughout the Washington–Baltimore corridor, call Long Engineering LLC and let's talk through what your property needs.
Areas We Serve
Bowie, MD
Baltimore, MD
Lanham, MD
Greenbelt, MD
College Park, MD
New Carrollton, MD
Real People. Real Results.
The technician was knowledgeable, professional and came highly recommended from my colleague. He explained my options and took the time to confirm my understanding.
I will definitely use them again!
- Kalin B.
