Heating & Cooling Done Right
Frederick's trusted HVAC experts — installation, repair, and maintenance done right the first time. Serving MD, DC, and VA.
500+
Systems Installed
15+
Years Experience
5★
Google Rating
24/7
Emergency Support
Certified Carrier Dealer
Factory-trained. Factory-backed.
Navien Preferred Installer
America's #1 condensing tankless brand.
Authorized Daikin Pro Dealer
World's #1 HVAC manufacturer.
Serving Frederick County & Beyond
From Frederick to the DC suburbs — we're your local HVAC experts across the region.
Frederick
Our Home Base
Germantown
Montgomery County
Rockville
Montgomery County
Gaithersburg
Montgomery County
Hagerstown
Washington County
Clarksburg
Montgomery County
Damascus
Montgomery County
Poolesville
Montgomery County
Bethesda
Montgomery County
Silver Spring
Montgomery County
Washington
DC
Northern Virginia
VA
Schedule Your Frederick HVAC Service Today
Based in Frederick, MD — we're your neighbors. Fast response times, free estimates on installations, and a 10% discount for veterans & military.
- Free estimates on all installations
- Same-day service available
- Licensed & insured in MD, DC & VA
- 10% discount for veterans & military
Frederick's HVAC Experts
J&P Mechanical Solutions is an HVAC company proudly based in Frederick, MD. We've been keeping homes and businesses comfortable across Frederick County and the surrounding region for over 15 years.
From ductless mini splits and heat pump installations to emergency repairs and Manual J load calculations, we bring engineering-grade precision to every job — no shortcuts, no guesswork.
We're your neighbors. We live and work in Frederick, and our reputation is built one satisfied customer at a time.
Fully Stocked & Ready to Roll
Our fleet of service vans is stocked with the parts and equipment needed to handle most repairs on the first visit — saving you time and money.
What We Do Best
Commercial HVAC
Full-service commercial HVAC installation, maintenance, and repair for businesses across Frederick, MD and the surrounding region.
Ductless Mini Splits
Mitsubishi, Daikin, and Carrier ductless systems — perfect for additions, garages, and homes without existing ductwork.
Repair & Diagnostics
$145 dispatch fee, waived if repair is accepted. Fast, accurate diagnostics to get your system back up and running.
Indoor Air Quality
AirScrubber, whole-home humidifiers, HEPA filtration, and ERVs to keep your Frederick home's air clean and healthy.
Properly Sized. Fully Permitted.
Every installation we do is backed by Manual J load calculations, Manual S equipment selection, and Manual D duct design — the ACCA-approved engineering standards required for permits and rebates across Maryland, DC & Virginia.
Manual J — Load Calculations
We calculate your home's exact heating and cooling load using ACCA Manual J. This ensures your new system is sized correctly — not too big, not too small — for maximum comfort and efficiency.
Manual S — Equipment Selection
Using the Manual J results, we select equipment that matches your home's actual load. Proper equipment selection is required for manufacturer warranty compliance and utility rebate programs.
Manual D — Duct Design
We design duct systems to ACCA Manual D standards, ensuring balanced airflow to every room. Proper duct sizing eliminates hot/cold spots and reduces energy waste.
Permitting & Code Compliance
We handle the full permit process — pulling permits, submitting Manual J/S/D documentation to the county, and scheduling inspections so your installation is fully code-compliant and insurable.
Why This Matters for You
- Required by Maryland, DC & Virginia building codes for new HVAC installations
- Necessary documentation for IRA tax credits and utility rebates
- Protects your equipment warranty — manufacturers require proper sizing
- Ensures your home insurance covers the installation
Certified. Authorized. Trusted.
We hold the highest dealer and installer certifications from the brands we install — so you get factory-backed warranties and expert service every time.
Carrier
Factory-trained. Factory-backed.
- Up to 26 SEER2 efficiency ratings
- 10-year parts warranty on Infinity Series
- Factory-certified installation & service
- Access to full Carrier product lineup
Navien
America's #1 condensing tankless brand.
- NPE Series tankless water heaters
- NCB Combi-Boilers — heat & hot water in one
- Up to 0.96 UEF energy efficiency
- Preferred Installer warranty protection
Daikin
World's #1 HVAC manufacturer.
- Up to 26 SEER2 ductless mini splits
- 12-year parts & compressor warranty
- VRF systems for commercial applications
- Advanced inverter technology
Ready for R-454B & Next-Gen Refrigerants
As the HVAC industry transitions to lower-GWP refrigerants like R-454B and R-32, J&P Mechanical Solutions stays ahead of the curve. Our technicians are trained and certified to handle modern refrigerants safely and efficiently.
View Our ServicesWhat Frederick Homeowners Say
Real reviews from real customers across Frederick County and the surrounding area.
"J&P installed a new heat pump system in our Frederick home and the difference is night and day. Professional, on time, and the price was fair. Highly recommend to anyone in the area."
Mike R.
Frederick, MD · Heat Pump Installation
"Had a Mitsubishi mini split installed in our sunroom. The team was knowledgeable, clean, and finished faster than expected. Our sunroom is finally comfortable year-round!"
Sarah L.
Germantown, MD · Ductless Mini Split
"AC went out on the hottest day of the year. J&P came out same day, diagnosed the issue quickly, and had us back up and running within hours. Outstanding service."
James T.
Gaithersburg, MD · HVAC Repair
"They did a full Manual J calculation before recommending a system size. No other contractor offered that. The new system runs perfectly and our energy bills dropped significantly."
Linda M.
Rockville, MD · Manual J Load Calc
We Honor Those Who Served
J&P Mechanical Solutions is proud to offer an exclusive discount to active military, veterans, and their families on all HVAC services and installations.
- 10% off all services
- Free WiFi thermostat with new unit
- Free high-efficiency filter with new unit
Get a Free Estimate in Frederick, MD
Phone
(301) 846-8616
Address
6242 Rainier Dr, Frederick, MD 21703
Hours
Mon–Fri: 7:30 AM – 5:00 PM
Sat–Sun: Emergency calls available
Proudly serving Frederick, Germantown, Rockville, Gaithersburg, Hagerstown, Clarksburg, Montgomery Village, Damascus, Poolesville, and surrounding communities in MD, DC, and VA.
Free estimates on all installations — no obligation