Mason Mechanical Services LLC
HVAC contractor in Jefferson, MD 21755
About this company
Mason Mechanical Services LLC is listed as an HVAC contractor at 4538 Timbery Dr in Jefferson, Maryland, in Frederick County. Federal motor carrier records list 2 drivers and 2 trucks for the company. It is one of 4 HVAC companies in ZIP 21755.
Other HVAC companies nearby
ACR Services4014 Mountville Rd, Jefferson
0.5 mi(301) 620-9400
Real Comfort Systems Heating and Cooling3886 Roundtree Rd Unit 1, Jefferson
0.9 mi(301) 662-3661
Woodlawn Mechanical Contractors4880 Winchester Blvd, Frederick
1.2 mi(301) 948-9141
Frederick Heating & Air Conditioning4801 Broad Run Rd, Jefferson
1.8 mi(240) 674-0814
Markool Heating & Cooling5110 Jefferson Pike, Frederick
2.0 mi(301) 732-4244
Housing market around ZIP 21755
Figures describe the local area, not this company.
Typical home value$560,000−0.2% past year · +59% in 10 years
12-month value outlook+0.1%Roughly flat
Days to sale agreement19Washington metro · 17 a year ago
New homes permitted, 20251,168Frederick County
Listings with a price cut29.4%Washington metro
Sale price vs list99.7%Washington metro
New construction sales489Washington metro, Aug · −24% from last year
Source: Zillow (home values, rent, outlook and metro sales), data through Sep 2026. Permits: U.S. Census Bureau.
Typical home value, last 10 years
Source: Zillow Home Value Index, Sep 2026.
Local building angle: Frederick County permitted 1,168 new homes in 2025, including 354 apartment units. 19% of the homes in this ZIP were built since 2000.
Local figures are estimates from public records and Zillow housing data, updated regularly.