HVAC companies in Eldersburg, MD 21784
3 HVAC companies, with local market data for this ZIP.
General contractors 49Concrete and masonry 10Remodeling 8Roofing and exteriors 6Carpentry, drywall and windows 5Electricians 4Fences and decks 4Excavation and demolition 3Painting 3HVAC 3Garage doors 2Other construction trades 2Flooring and tile 2
Area profitability, HVAC74 / 100Strong market, balanced field
Typical home value$553,000+0.5% in the past year
New homes permitted, 2025153Carroll County
Homeowners87.3%13,216 households
Source: Zillow (home value and housing demand in the score), data through Sep 2026. Permits and households: U.S. Census Bureau.
Design Flow Heating & Cooling LLCHVAC contractor · 5975 Exchange Dr Ste C, Eldersburg(443) 878-8278 · designflowhvac.com
Will AirHVAC contractor · 5389 Enterprise St Ste F, Sykesville(410) 549-9300 · willairllc.com
Global HVAC LLCHVAC contractor · Sykesville(410) 696-2227 · 2 drivers, 2 trucks
HVAC in ZIP 21784 at a glance
Local building angle: Carroll County permitted 153 new homes in 2025. 21% of the homes in this ZIP were built since 2000.
Local figures are estimates from public records and Zillow housing data, updated regularly.