Providing reliable residential and commercial HVAC installation, repairs, maintenance, ductwork, and indoor air quality solutions with honest pricing and exceptional customer service.
We combine seasoned expertise with transparent pricing and modern equipment to deliver comfort you can trust for years to come.
G&J HVAC Design was founded on the belief that homeowners and businesses deserve reliable comfort, honest pricing, and lasting partnerships. We are dedicated to delivering efficient solutions, transparent communication, and service with integrity—today, tomorrow, and for years to come.
“Professionalism, integrity, and long-term relationships are the core of our work.”
Professional, transparent, and comprehensive services for homes and businesses.
Proudly serving Baltimore and surrounding Maryland communities. Click a pin to learn more.
Real projects showcasing our craftsmanship in heating, cooling, and indoor air quality upgrades.
Five-star reviews from homeowners and business owners across Baltimore.
Make your next HVAC upgrade affordable with flexible monthly payments and zero-interest offers where available.
Low monthly payments with 0% APR for 12 months on qualifying systems.
Competitive rates with longer terms for larger installations.
Custom financing for commercial projects with flexible terms.
Protect your equipment with proactive care. Our maintenance plan delivers peace of mind through seasonal tune-ups, priority scheduling, and ongoing efficiency improvements.
HVAC replacement involves removing an aging or inefficient system and installing a modern, energy-efficient unit that meets your home or business needs. We recommend replacement when repair costs exceed a practical percentage of a new system, or when your current equipment cannot meet demand efficiently.
We perform thorough diagnostic testing, provide transparent quotes, and use OEM parts. We focus on quick, reliable fixes and long-term reliability.
Yes. Regular maintenance improves efficiency, reduces costs, prolongs life, and helps prevent unexpected breakdowns.
Absolutely. We offer 24/7 emergency support for critical heating and cooling failures.
We offer flexible plans with low monthly payments and occasional 0% APR promotions for qualifying projects.
Manufacturer warranties are supported through our services. We also offer extended warranty options on select equipment.
Yes. We tailor IAQ solutions including enhanced filtration, purification systems, and humidity control.
We install and service heat pumps for efficient year-round comfort, with system sizing and zoning options.
Upgrading to high-efficiency equipment, optimizing ductwork, and installing smart controls can significantly reduce energy use.
Tell us about your project and we will reach out with a tailored solution and transparent pricing.