Mannix Heating and Cooling- Gaithersburg
Gaithersburg, MD HVAC · #5 of 5 · NATE-certified · 16+ yrs
At a glance
- Google rating
- 4.9★ from 175+ reviews
- In business
- 16+ years
- Services
- 8 HVAC services
- Service area
- Gaithersburg, MD + 4 nearby
- Phone
- +1-301-260-6000
Mannix Heating and Cooling- Gaithersburg as a HVAC provider
Gaithersburg, MD HVAC · #5 of 5 · NATE-certified · 16+ yrs
Mannix positions itself as an ac repair specialist with many documented service calls.
Residential and light-commercial HVAC services in Gaithersburg, focused on AC repair and installations.
Gaithersburg, MD HVAC average is 83/100. Ranks #5 of 5 listed HVAC providers in Gaithersburg, MD.
| Signal | Mannix Heating and Cooling- G… | Gaithersburg avg | Delta |
|---|---|---|---|
| Vouched Score | 75/100 | 83/100 | -8 vs avg |
| Google rating | 4.9★ | 4.9★ | matches city average |
| Review volume | 175+ | 2,300+ | -2122 vs avg |
| Years in business | 16+ | 29+ | -13 vs avg |
- High Google rating (4.9★ across 175+ reviews)
- Long-established (16+ years in business)
- Authorized Carrier Factory Authorized Dealer
- NATE-certified technicians
- Emergency response: 24-hour
- Financing available
- Specializes in AC repair
- You need AC repair
- You need heat pump installation
- You need mini-split installation
- You need to finance the work
- You want a BBB-rated firm specifically
| Provider | Vouched | Years | BBB | Yelp | Our picks | |
|---|---|---|---|---|---|---|
Mannix Heating and Cooling- Gaithersburg (this company) |
75/100 | 4.9★ (175+) | 16+ | — | — | Ductwork & Sealing Energy-Efficient Systems |
| 84/100 | 4.8★ (690+) | 45+ | — | — | — | |
| 81/100 | 4.8★ (2,510+) | 20+ | — | — | American Standard Dealer in Gaithersburg | |
| 94/100 | 4.9★ (7,720+) | 56+ | — | — | Highest Vouched Score Best for Smart Thermostat Install |
Mannix Heating and Cooling- Gaithersburg as a Emergency AC Repair provider
Gaithersburg, MD Emergency AC Repair · #4 of 5 · NATE-certified · 16+ yrs
Mannix advertises a 24-hour emergency response window for urgent cooling failures. The company lists same-day and weekend emergency service availability. Mannix is a Carrier Factory Authorized Dealer and notes A2L-capable refrigerant work. Mannix has served the region since 2010, addressing Gaithersburg's hot, humid summers and winter swings.
Emergency AC repair in Gaithersburg, focused on after-hours and same-day cooling restoration. NATE-certified technicians listed on the company profile. Carrier Factory Authorized Dealer status appears on the site. 15+ years in business serving Montgomery County homes and businesses.
Gaithersburg, MD Emergency AC Repair average is 81/100. Ranks #4 of 5 listed Emergency AC Repair providers in Gaithersburg, MD.
| Signal | Mannix Heating and Cooling- G… | Gaithersburg avg | Delta |
|---|---|---|---|
| Vouched Score | 77/100 | 81/100 | -4 vs avg |
| Google rating | 4.9★ | 4.9★ | matches city average |
| Review volume | 175+ | 2,300+ | -2122 vs avg |
| Years in business | 16+ | 29+ | -13 vs avg |
- High Google rating (4.9★ across 175+ reviews)
- Long-established (16+ years in business)
- Authorized Carrier Factory Authorized Dealer
- NATE-certified technicians
- Emergency response: 24-hour
- Financing available
- You need same-day AC repair
- You need after-hours AC repair
- You need commercial emergency AC repair
- You need same-day or after-hours service
- You want manufacturer-warranty installation work
- You want a BBB-rated firm specifically
| Provider | Vouched | Years | BBB | Yelp | Our picks | |
|---|---|---|---|---|---|---|
Mannix Heating and Cooling- Gaithersburg (this company) |
77/100 | 4.9★ (175+) | 16+ | — | — | — |
| 88/100 | 4.9★ (7,725+) | 56+ | — | — | — | |
| 87/100 | 4.8★ (2,510+) | 20+ | — | — | Highest Vouched Score No Overtime or Holiday Surcharge Best for No-Cooling Emergencies |
|
| 79/100 | 4.8★ (690+) | 45+ | — | — | Best for Commercial Emergencies |
Mannix Heating and Cooling- Gaithersburg as a AC Replacement provider
Gaithersburg, MD AC Replacement · #4 of 4 · NATE-certified · 16+ yrs
Mannix lists variable-speed, inverter equipment as a core offering. Mannix is a Carrier Factory Authorized Dealer per their site. Mannix says ACCA load calculations guide replacement sizing. Mannix advertises A2L capability for modern refrigerants. Mannix highlights same-day or 24-hour emergency response in Gaithersburg's summer heat.
Central AC replacement and heat pump installs around Gaithersburg, MD. Manufacturer dealer: Carrier Factory Authorized Dealer, per their site. NATE-certified techs and A2L certification are listed on the company pages. Manual J sizing: Mannix notes ACCA load calculations guide replacement right-sizing.
Gaithersburg, MD AC Replacement average is 81/100. Ranks #4 of 4 listed AC Replacement providers in Gaithersburg, MD.
| Signal | Mannix Heating and Cooling- G… | Gaithersburg avg | Delta |
|---|---|---|---|
| Vouched Score | 76/100 | 81/100 | -5 vs avg |
| Google rating | 4.9★ | 4.9★ | matches city average |
| Review volume | 175+ | 2,245+ | -2069 vs avg |
| Years in business | 16+ | 31+ | -15 vs avg |
- High Google rating (4.9★ across 175+ reviews)
- Long-established (16+ years in business)
- Authorized Carrier Factory Authorized Dealer
- NATE-certified technicians
- Emergency response: 24-hour
- Satisfaction guarantee
- Financing available
- You need AC + furnace system replacement
- You need same-day AC replacement
- You need high-efficiency AC replacement
- You need same-day or after-hours service
- You want manufacturer-warranty installation work
- You want a BBB-rated firm specifically
| Provider | Vouched | Years | BBB | Yelp | Our picks | |
|---|---|---|---|---|---|---|
Mannix Heating and Cooling- Gaithersburg (this company) |
76/100 | 4.9★ (175+) | 16+ | — | — | Best for Proper Sizing Best for Full-System Changeout |
| 89/100 | 4.9★ (7,725+) | 56+ | — | — | Best for High-Efficiency Upgrades | |
| 79/100 | 4.9★ (395+) | 7+ | — | — | Best NATE-Certified Installer | |
| 79/100 | 4.8★ (690+) | 45+ | — | — | — |
Mannix Heating and Cooling- Gaithersburg as a AC Repair provider
Gaithersburg, MD AC Repair · #4 of 4 · NATE-certified · 16+ yrs
AC repair specialization is emphasized across Mannix's Gaithersburg service pages. Carrier Factory Authorized Dealer status appears on their site. Mannix notes NATE-certification and A2L modern-refrigerant capability. Mannix highlights a 24-hour answering and emergency response system. Mannix lists about fifteen years servicing area homes and businesses.
AC repair and emergency cooling service in Gaithersburg, MD, focused on residential and light-commercial systems. NATE-certified technicians and Carrier Factory Authorized Dealer status are listed. A2L modern-refrigerant capability and 24-hour emergency response are stated. Years in business listed as 15+ years.
Gaithersburg, MD AC Repair average is 81/100. Ranks #4 of 4 listed AC Repair providers in Gaithersburg, MD.
| Signal | Mannix Heating and Cooling- G… | Gaithersburg avg | Delta |
|---|---|---|---|
| Vouched Score | 75/100 | 81/100 | -6 vs avg |
| Google rating | 4.9★ | 4.9★ | matches city average |
| Review volume | 175+ | 2,245+ | -2069 vs avg |
| Years in business | 16+ | 31+ | -15 vs avg |
- High Google rating (4.9★ across 175+ reviews)
- Long-established (16+ years in business)
- Authorized Carrier Factory Authorized Dealer
- NATE-certified technicians
- Emergency response: 24-hour
- Financing available
- Specializes in AC repair
- You need AC refrigerant leak repair
- You need AC compressor replacement
- You need AC tune-up & maintenance
- You need same-day or after-hours service
- You want manufacturer-warranty installation work
- You want a BBB-rated firm specifically
| Provider | Vouched | Years | BBB | Yelp | Our picks | |
|---|---|---|---|---|---|---|
Mannix Heating and Cooling- Gaithersburg (this company) |
75/100 | 4.9★ (175+) | 16+ | — | — | Best for Compressor Replacement Best Manufacturer-Authorized Repair |
| 88/100 | 4.9★ (7,725+) | 56+ | — | — | — | |
| 82/100 | 4.8★ (690+) | 45+ | — | — | Best for Commercial AC Repair | |
| 79/100 | 4.9★ (395+) | 7+ | — | — | Best NATE-Certified Shop |
Mannix Heating and Cooling- Gaithersburg as a Mini-Split Installation provider
Gaithersburg, MD Mini-Split Installation · #5 of 5 · NATE-certified · 16+ yrs
Mannix highlights ductless mini-split installation experience and multi-head commercial ductless work. The company lists Carrier Factory Authorized Dealer status on its site. Mannix reports 15+ years serving Montgomery County homes and businesses. The firm notes same-day or 24-hour emergency response availability for Gaithersburg HVAC issues.
Ductless mini-split installation in Gaithersburg and nearby Montgomery County. The site lists NATE-certified technicians as part of the team. Carrier Factory Authorized Dealer status is noted for manufacturer-backed installations. Emergency response is advertised as 24-hour for urgent heating and cooling failures.
Gaithersburg, MD Mini-Split Installation average is 79/100. Ranks #5 of 5 listed Mini-Split Installation providers in Gaithersburg, MD.
| Signal | Mannix Heating and Cooling- G… | Gaithersburg avg | Delta |
|---|---|---|---|
| Vouched Score | 75/100 | 79/100 | -4 vs avg |
| Google rating | 4.9★ | 4.9★ | matches city average |
| Review volume | 175+ | 1,860+ | -1683 vs avg |
| Years in business | 16+ | 37+ | -21 vs avg |
- High Google rating (4.9★ across 175+ reviews)
- Long-established (16+ years in business)
- Authorized Carrier Factory Authorized Dealer
- NATE-certified technicians
- Emergency response: 24-hour
- Financing available
- You need commercial VRF installation
- You need same-day or after-hours service
- You want manufacturer-warranty installation work
- You need to finance the work
- You have a commercial property
- You want a BBB-rated firm specifically
| Provider | Vouched | Years | BBB | Yelp | Our picks | |
|---|---|---|---|---|---|---|
Mannix Heating and Cooling- Gaithersburg (this company) |
75/100 | 4.9★ (175+) | 16+ | — | — | Best for Whole-Home Mini-Split Installation |
| 87/100 | 4.9★ (7,725+) | 56+ | — | — | Highest Vouched Score | |
| 78/100 | 4.8★ (690+) | 45+ | — | — | Best for Mini-Split Repair | |
| 77/100 | 4.9★ (315+) | 60+ | — | — | Best for Commercial / VRF |
Mannix Heating and Cooling- Gaithersburg as a Furnace Replacement provider
Gaithersburg, MD Furnace Replacement · #3 of 4 · NATE-certified · 16+ yrs
Mannix Heating and Cooling- Gaithersburg notes high-efficiency condensing furnaces and variable-speed equipment. Mannix states Carrier Factory Authorized Dealer status for manufacturer-backed installations. Mannix lists NATE-certified technicians on staff. Montgomery County winters and summer humidity drive demand for properly vented condensing furnaces locally. Mannix advertises 24-hour emergency response and financing for larger replacements.
Furnace replacement in Gaithersburg, MD focused on high-efficiency condensing and variable-speed equipment. NATE-certified technicians, per their site, perform installations and service. Carrier Factory Authorized Dealer status, per their site, for manufacturer-backed installs. Emergency response advertised as 24-hour for urgent heating failures.
Gaithersburg, MD Furnace Replacement average is 75/100. Ranks #3 of 4 listed Furnace Replacement providers in Gaithersburg, MD.
| Signal | Mannix Heating and Cooling- G… | Gaithersburg avg | Delta |
|---|---|---|---|
| Vouched Score | 72/100 | 75/100 | -3 vs avg |
| Google rating | 4.9★ | 4.9★ | matches city average |
| Review volume | 175+ | 2,245+ | -2069 vs avg |
| Years in business | 16+ | 31+ | -15 vs avg |
- High Google rating (4.9★ across 175+ reviews)
- Long-established (16+ years in business)
- Authorized Carrier Factory Authorized Dealer
- NATE-certified technicians
- Emergency response: 24-hour
- Financing available
- You need same-day furnace replacement
- You need high-efficiency furnace replacement
- You need gas furnace replacement
- You need same-day or after-hours service
- You want manufacturer-warranty installation work
- You want a BBB-rated firm specifically
| Provider | Vouched | Years | BBB | Yelp | Our picks | |
|---|---|---|---|---|---|---|
Mannix Heating and Cooling- Gaithersburg (this company) |
72/100 | 4.9★ (175+) | 16+ | — | — | — |
| 89/100 | 4.9★ (7,725+) | 56+ | — | — | Best for High-Efficiency (95%+ AFUE) Upgrades Best for Gas Furnace Replacement |
|
| 77/100 | 4.9★ (395+) | 7+ | — | — | Best for Furnace + AC Changeout Best NATE-Certified Installer |
|
| 63/100 | 4.8★ (690+) | 45+ | — | — | — |
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.
- Duct Work — Ductwork inspection, sealing, and replacement — addresses leakage, undersized runs, and uneven room temperatures.
Service area
Guarantees & credentials
- 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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Profile last updated July 20, 2026.