Donmar Heating, Cooling & Plumbing
Rockville, MD HVAC · #4 of 5 · NATE-certified · 36+ yrs
At a glance
- Google rating
- 4.9★ from 115+ reviews
- In business
- 36+ years
- Services
- 8 HVAC services
- Service area
- Rockville, MD + 4 nearby
- Phone
- +1-301-250-1899
Donmar Heating, Cooling & Plumbing as a HVAC provider
Rockville, MD HVAC · #4 of 5 · NATE-certified · 36+ yrs
Donmar lists AC repair and same-day emergency cooling responses prominently. The company notes NATE-certified technicians on staff. Founded in 1990, Donmar shows 35+ years in business. Their site details Pepco and Washington Gas rebates for Maryland homeowners. Reviews and site content emphasize available financing and free estimates.
Full-service HVAC contractor serving Northern Virginia and Maryland, focused on heat pumps and ductless mini-splits. NATE-certified technicians on staff, per their website. SEER2 specifications are listed, including 15.2 SEER2 and 7.5 HSPF2 for qualifying systems. Free estimates and financing are available, per their site.
Rockville, MD HVAC average is 80/100. Ranks #4 of 5 listed HVAC providers in Rockville, MD.
| Signal | Donmar Heating, Cooling & Plumbing | Rockville avg | Delta |
|---|---|---|---|
| Vouched Score | 75/100 | 80/100 | -5 vs avg |
| Google rating | 4.9★ | 4.8★ | +0.1 vs avg |
| Review volume | 115+ | 1,850+ | -1737 vs avg |
| Years in business | 36+ | 46+ | -10 vs avg |
- High Google rating (4.9★ across 115+ reviews)
- Long-established (36+ years in business)
- NATE-certified technicians
- Emergency response: 24/7
- Financing available
- Free estimates
- Specializes in AC repair
- You need AC repair
- You need to finance the work
- You value a long-tenured local operator (36+ years in business)
- You want NATE-certified technicians
- You want a BBB-rated firm specifically
| Provider | Vouched | Years | BBB | Yelp | Our picks | |
|---|---|---|---|---|---|---|
Donmar Heating, Cooling & Plumbing (this company) |
75/100 | 4.9★ (115+) | 36+ | — | — | Rebates & Tax Credits Energy-Efficient Systems |
| 80/100 | 4.8★ (910+) | 27+ | — | — | — | |
| 88/100 | 4.7★ (6,625+) | 45+ | — | — | Highest Vouched Score Best for Furnace Repair Best for Ductwork & Sealing |
|
| 85/100 | 4.7★ (1,480+) | 92+ | — | — | Best for Financing Options Best for Free Estimates |
Donmar Heating, Cooling & Plumbing as a AC Replacement provider
Rockville, MD AC Replacement · #4 of 5 · NATE-certified · 36+ yrs
High-efficiency variable-speed equipment is a named upgrade on Donmar's site. Donmar lists NATE-certified technicians for installations and service. Donmar notes experience servicing Northern Virginia and Maryland since 1990. Donmar says they outline both repair and replacement options during estimates. Donmar advertises flat-rate pricing, financing, and free estimates.
Central AC system replacement and full-system changeouts across Rockville and nearby Maryland neighborhoods. NATE-certified technicians are listed on the company website. Years in business reported as 35+ years serving Northern Virginia and Maryland. Financing options and free estimates are advertised, with 24/7 emergency response noted.
Rockville, MD AC Replacement average is 77/100. Ranks #4 of 5 listed AC Replacement providers in Rockville, MD.
| Signal | Donmar Heating, Cooling & Plumbing | Rockville avg | Delta |
|---|---|---|---|
| Vouched Score | 75/100 | 77/100 | -2 vs avg |
| Google rating | 4.9★ | 4.8★ | +0.1 vs avg |
| Review volume | 115+ | 1,850+ | -1737 vs avg |
| Years in business | 36+ | 46+ | -10 vs avg |
- High Google rating (4.9★ across 115+ reviews)
- Long-established (36+ years in business)
- NATE-certified technicians
- Emergency response: 24/7
- Financing available
- Free estimates
- Flat-rate, upfront pricing
- You need same-day AC replacement
- You need same-day or after-hours service
- You need to finance the work
- You value a long-tenured local operator (36+ years in business)
- You want NATE-certified technicians
- You want a BBB-rated firm specifically
| Provider | Vouched | Years | BBB | Yelp | Our picks | |
|---|---|---|---|---|---|---|
Donmar Heating, Cooling & Plumbing (this company) |
75/100 | 4.9★ (115+) | 36+ | — | — | Best for Honest Replace-vs-Repair Best for High-Efficiency Upgrades Best for Full-System Changeout |
| 83/100 | 4.7★ (6,625+) | 45+ | — | — | Best for Full-System Changeout | |
| 80/100 | 4.7★ (1,480+) | 92+ | — | — | Best for Commercial AC Replacement | |
| 78/100 | 4.8★ (910+) | 27+ | — | — | — |
Donmar Heating, Cooling & Plumbing as a Heat Pump Installation provider
Rockville, MD Heat Pump Installation · #6 of 7 · NATE-certified · 36+ yrs
Donmar lists ducted air-source heat pump installations with carrier rebate support. The company reports NATE-certified technicians on staff. Rockville's humid summers and chilly winters make proper sizing essential. Donmar notes financing options and free estimates for larger upgrades. The website advertises emergency response and same-day service availability.
Ducted air-source heat pump installations serving Rockville and nearby Northern Virginia and Maryland. NATE-certified technicians perform installations and service, per their site. Financing available and free estimates are listed for high-ticket upgrades. Established 35+ years in business.
Rockville, MD Heat Pump Installation average is 79/100. Ranks #6 of 7 listed Heat Pump Installation providers in Rockville, MD.
| Signal | Donmar Heating, Cooling & Plumbing | Rockville avg | Delta |
|---|---|---|---|
| Vouched Score | 73/100 | 79/100 | -6 vs avg |
| Google rating | 4.9★ | 4.8★ | +0.1 vs avg |
| Review volume | 115+ | 1,575+ | -1459 vs avg |
| Years in business | 36+ | 37+ | -1 vs avg |
- High Google rating (4.9★ across 115+ reviews)
- Long-established (36+ years in business)
- NATE-certified technicians
- Emergency response: 24/7
- Financing available
- Free estimates
- Flat-rate, upfront pricing
- You need heat pump replacement
- You need dual-fuel heat pump installation
- You need same-day or after-hours service
- You need to finance the work
- You value a long-tenured local operator (36+ years in business)
- You want a BBB-rated firm specifically
| Provider | Vouched | Years | BBB | Yelp | Our picks | |
|---|---|---|---|---|---|---|
Donmar Heating, Cooling & Plumbing (this company) |
73/100 | 4.9★ (115+) | 36+ | — | — | — |
| 86/100 | 4.7★ (6,625+) | 45+ | — | — | — | |
| 84/100 | 4.7★ (1,480+) | 92+ | — | — | — | |
| 83/100 | 5.0★ (1,050+) | 10+ | — | — | — |
Donmar Heating, Cooling & Plumbing as a Mini-Split Installation provider
Rockville, MD Mini-Split Installation · #4 of 5 · NATE-certified · 36+ yrs
Donmar lists ductless mini-split installation and repair among core offerings. Donmar reports NATE-certified technicians on staff. Donmar notes flat-rate pricing, financing, and free estimates on its site. Rockville homeowners face humid summers and cold winters, and Donmar references sizing and efficiency for local climate.
Ductless mini-split installation for homeowners across Rockville, Northern Virginia, and Maryland. NATE-certified technicians are listed on Donmar's website. Flat-rate pricing, financing, and free estimates are advertised. Emergency response is advertised 24/7 for urgent HVAC needs.
Rockville, MD Mini-Split Installation average is 78/100. Ranks #4 of 5 listed Mini-Split Installation providers in Rockville, MD.
| Signal | Donmar Heating, Cooling & Plumbing | Rockville avg | Delta |
|---|---|---|---|
| Vouched Score | 73/100 | 78/100 | -5 vs avg |
| Google rating | 4.9★ | 4.8★ | +0.1 vs avg |
| Review volume | 115+ | 1,850+ | -1737 vs avg |
| Years in business | 36+ | 46+ | -10 vs avg |
- High Google rating (4.9★ across 115+ reviews)
- Long-established (36+ years in business)
- NATE-certified technicians
- Emergency response: 24/7
- Financing available
- Free estimates
- Flat-rate, upfront pricing
- You need same-day or after-hours service
- You need to finance the work
- You value a long-tenured local operator (36+ years in business)
- You want NATE-certified technicians
- You want a BBB-rated firm specifically
| Provider | Vouched | Years | BBB | Yelp | Our picks | |
|---|---|---|---|---|---|---|
Donmar Heating, Cooling & Plumbing (this company) |
73/100 | 4.9★ (115+) | 36+ | — | — | — |
| 84/100 | 4.7★ (6,625+) | 45+ | — | — | — | |
| 83/100 | 4.7★ (1,480+) | 92+ | — | — | — | |
| 80/100 | 4.8★ (910+) | 27+ | — | — | — |
What customers say
Services
- AC Repair — Diagnostics and repair of central air conditioning systems — refrigerant leaks, capacitor and contactor failures, condenser fan motors, and thermostat issues.
- AC Replacement — Removal and replacement of an aging or failed central A/C — typically condenser, evaporator coil, and refrigerant lines.
- HVAC Installation — Full HVAC system installation including indoor and outdoor equipment, ductwork tie-in, and refrigerant work.
- Emergency HVAC Service — After-hours emergency response for no-cool and no-heat calls.
- Mini-Split Systems — Mini-split installation and service — typically ductless, used for additions or zoned comfort.
- Indoor Air Quality — Indoor air-quality work: high-MERV filtration, UV systems, humidifiers/dehumidifiers, and duct sanitization.
Service area
Published pricing
Pricing model
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Flat-rate pricing
As published: Flat-rate pricing"…heck out our special financing offers. SEE OFFERS Flat Rate Pricing No hidden costs or mysterious fees! Rest assured…"
Estimates
-
Free estimates
As published: Free estimates"…e Financing Options with Approved Credit Offering Free Estimates On HVAC Replacements NATE Certified Technicians E…"
Guarantees & credentials
- NATE-certified
- NATE Certified
Sourced from the provider's own website. We surface these as published; we do not independently verify each license or warranty.
Contact & hours
Frequently asked questions
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What does HVAC service typically cost when working with a Rockville, MD provider like Donmar Heating, Cooling & Plumbing?
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Does Donmar Heating, Cooling & Plumbing do AC Repair in Rockville, MD?
Does Donmar Heating, Cooling & Plumbing do AC Replacement in Rockville, MD?
Does Donmar Heating, Cooling & Plumbing do HVAC Installation in Rockville, MD?
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Profile last updated July 20, 2026.