Cornerstone Heating & Air Conditioning Inc
HVAC contractor in Thurmont, MD 21788
About this company
Cornerstone Heating & Air Conditioning Inc is listed as an HVAC contractor at 101 Radio Ln in Thurmont, Maryland, in Frederick County. Federal motor carrier records list 1 drivers and 2 trucks for the company. It is one of 2 HVAC companies in ZIP 21788.
Other HVAC companies nearby
Mick's Plumbing & Heating27 Howard St, Thurmont
0.6 mi(301) 271-2488
Holtzople Heating & Air Conditioning16424 Old Frederick Rd, Emmitsburg
5.4 mi(866) 500-4328
Right-A-Way Heating & Cooling10534 Dublin Rd, Walkersville
7.5 mi(301) 845-7710
Kaufman's Heating & Air LLC12467 Woodsboro Pike, Keymar
8.2 mi(301) 898-9191
Kevin's Precision HVAC12834 Greensburg Rd, Smithsburg
8.5 mi(301) 401-2812
Housing market around ZIP 21788
Figures describe the local area, not this company.
Typical home value$391,000+0.4% past year · +65% 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. 17% of the homes in this ZIP were built since 2000.
Local figures are estimates from public records and Zillow housing data, updated regularly.