Donmar Heating, Cooling & Plumbing

HVAC contractor in Rockville, MD 20850

Call (301) 250-1899 donmarcompany.com Directions

About this company

Donmar Heating, Cooling & Plumbing is listed as an HVAC contractor at 1106 Taft St in Rockville, Maryland, in Montgomery County. It is one of 11 HVAC companies in ZIP 20850.

Other HVAC companies nearby

Richard's Heating & Air Conditioning Co., Inc.1105 Taft St, Rockville

Under 0.1 mi(301) 417-2455

F.H. Furr Plumbing, Heating, Air Conditioning & Electrical685 Lofstrand Ln, Rockville

0.1 mi(703) 497-0180

Robinson's Air Conditioning & Heating671 Southlawn Ln, Rockville

0.2 mi(301) 871-8902

Air Supply14672 Southlawn Ln M, Rockville

0.2 mi(240) 982-5023

Quality Air Services, LLC655 N Horners Lane, Rockville

0.5 mi(301) 893-7778

Strong market, crowded fieldArea profitability for HVAC in ZIP 20850

Housing demand78

Sales pace, new listings and new construction. Source: Zillow

Customer spending power93

Household income and home values

Room for another HVAC company24

More crowded than 76% of US ZIPs

Scored against every US ZIP. An index of local conditions, not this company's results.

County context

One of 116 HVAC companies in Montgomery County, MD.

992 general contractors in Montgomery County, MD.

All 1,757 construction companies in Montgomery County, MD.

ZIP 20850 at a glance

Population: 50,353 (1,377 per sq mi)
Median age: 41
Households: Median income $125,950 · 60% earn six figures
Housing: 50% owner-occupied
Workforce: 67% labor-force participation · 4.6% unemployment

ZIP figures are US Census estimates for the ZIP area, not the company.

Housing market around ZIP 20850

Figures describe the local area, not this company.

Typical home value$671,000−1.1% past year · +30% in 10 years

Typical rent$2,467+1.0% past year

12-month value outlook+0.2%Roughly flat

New homes permitted, 20251,411Montgomery County

Days to sale agreement19Washington metro · 17 a year ago

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: Montgomery County permitted 1,411 new homes in 2025, including 559 apartment units. 44% of the homes in this ZIP were built since 2000.

Local figures are estimates from public records and Zillow housing data, updated regularly.