Markool Heating Cooling Plumbing
Frederick, MD HVAC · #5 of 5 · NATE-certified · 10+ yrs
At a glance
- Google rating
- 4.9★ from 575+ reviews
- In business
- 10+ years
- Services
- 7 HVAC services
- Service area
- Frederick, MD + 7 nearby
- Phone
- +1-301-732-4244
Markool Heating Cooling Plumbing as a HVAC provider
Frederick, MD HVAC · #5 of 5 · NATE-certified · 10+ yrs
ac repair specialization is evident from fast, same-day diagnostic stories in local reviews. Markool states its technicians are NATE-certified and factory-trained. The company advertises Carrier Factory Authorized Dealer status for premium equipment access. Markool notes 24/7 emergency response for Frederick's hot summers and cold winters. Reviews mention maintenance-plan enrollments and punctual, courteous technicians.
Residential and commercial HVAC service focused on rapid AC repair in Frederick, MD. NATE-certified technicians and Carrier Factory Authorized Dealer training support installations. Emergency service is available (advertised 24/7). Free estimates are advertised for system quotes.
Frederick, MD HVAC average is 84/100. Ranks #5 of 5 listed HVAC providers in Frederick, MD.
| Signal | Markool Heating Cooling Plumbing | Frederick avg | Delta |
|---|---|---|---|
| Vouched Score | 81/100 | 84/100 | -3 vs avg |
| Google rating | 4.9★ | 4.9★ | matches city average |
| Review volume | 575+ | 780+ | -203 vs avg |
| Years in business | 10+ | 42+ | -32 vs avg |
- High Google rating (4.9★ across 575+ reviews)
- Long-established (10+ years in business)
- Authorized Carrier Factory Authorized Dealer
- NATE-certified technicians
- Emergency response: 24/7
- Financing available
- Free estimates
- Specializes in AC repair
- You need AC system replacement
- You need AC repair
- You need mini-split installation
- You want a top-rated provider with substantial review history (4.9★, 575+ reviews)
- You want a BBB-rated firm specifically
| Provider | Vouched | Years | BBB | Yelp | Our picks | |
|---|---|---|---|---|---|---|
Markool Heating Cooling Plumbing (this company) |
81/100 | 4.9★ (575+) | 10+ | — | — | — |
| 83/100 | 4.8★ (1,025+) | 66+ | — | — | Best for Ductwork & Sealing | |
| 85/100 | 4.9★ (770+) | 34+ | — | — | Best NATE-Certified Team | |
| 84/100 | 4.8★ (560+) | 89+ | — | — | Best for Furnace Repair Best Labor Warranty |
Markool Heating Cooling Plumbing as a AC Repair provider
Frederick, MD AC Repair · #2 of 5 · NATE-certified · 10+ yrs
Markool emphasizes AC repair and diagnostics, citing capacitor and motor work outcomes. The company lists NATE-certified technicians on its site. Markool notes Carrier Factory Authorized Dealer status for factory training and parts access. Frederick's hot, humid summers increase cooling demand; Markool advertises 24/7 emergency response. Founded 2016, the site indicates ten-plus years of local operation.
Markool Heating Cooling Plumbing handles AC repair and diagnostics in Frederick, MD. NATE-certified technicians, per their site, state over twenty years' team experience. Carrier Factory Authorized Dealer status is advertised by the company. Emergency service is available 24/7 and free estimates are listed online.
At the Frederick, MD AC Repair average (81/100). Ranks #2 of 5 listed AC Repair providers in Frederick, MD.
| Signal | Markool Heating Cooling Plumbing | Frederick avg | Delta |
|---|---|---|---|
| Vouched Score | 81/100 | 81/100 | matches city average |
| Google rating | 4.9★ | 4.9★ | matches city average |
| Review volume | 575+ | 780+ | -203 vs avg |
| Years in business | 10+ | 42+ | -32 vs avg |
- High Google rating (4.9★ across 575+ reviews)
- Long-established (10+ years in business)
- Authorized Carrier Factory Authorized Dealer
- NATE-certified technicians
- Emergency response: 24/7
- Financing available
- Free estimates
- You need AC tune-up & maintenance
- You need commercial AC repair
- You need same-day or after-hours service
- You want manufacturer-warranty installation work
- You need to finance the work
- You want a BBB-rated firm specifically
| Provider | Vouched | Years | BBB | Yelp | Our picks | |
|---|---|---|---|---|---|---|
Markool Heating Cooling Plumbing (this company) |
81/100 | 4.9★ (575+) | 10+ | — | — | Best NATE-Certified Shop |
| 82/100 | 4.9★ (770+) | 34+ | — | — | — | |
| 81/100 | 5.0★ (960+) | 10+ | — | — | — | |
| 81/100 | 4.8★ (1,025+) | 66+ | — | — | — |
Markool Heating Cooling Plumbing as a Heat Pump Installation provider
Frederick, MD Heat Pump Installation · #3 of 4 · NATE-certified · 10+ yrs
Markool Heating Cooling Plumbing is a Carrier Factory Authorized Dealer. Markool lists NATE-certified technicians on staff. Markool cites local experience across Maryland's hot summers and cold winters. Markool notes ACCA membership and free estimates for new system work.
Residential and commercial heat pump installation and replacements in Frederick, MD. NATE-certified technicians and factory training reported, with Carrier product access. 10+ years in business (founded 2016) according to site history. Free estimates and advertised financing options are available for major installs.
Frederick, MD Heat Pump Installation average is 84/100. Ranks #3 of 4 listed Heat Pump Installation providers in Frederick, MD.
| Signal | Markool Heating Cooling Plumbing | Frederick avg | Delta |
|---|---|---|---|
| Vouched Score | 81/100 | 84/100 | -2 vs avg |
| Google rating | 4.9★ | 4.9★ | matches city average |
| Review volume | 575+ | 835+ | -258 vs avg |
| Years in business | 10+ | 30+ | -20 vs avg |
- High Google rating (4.9★ across 575+ reviews)
- Long-established (10+ years in business)
- Authorized Carrier Factory Authorized Dealer
- NATE-certified technicians
- Emergency response: 24/7
- Financing available
- Free estimates
- You need heat pump replacement
- You need same-day or after-hours service
- You want manufacturer-warranty installation work
- You need to finance the work
- You want a top-rated provider with substantial review history (4.9★, 575+ reviews)
- You want a BBB-rated firm specifically
| Provider | Vouched | Years | BBB | Yelp | Our picks | |
|---|---|---|---|---|---|---|
Markool Heating Cooling Plumbing (this company) |
81/100 | 4.9★ (575+) | 10+ | — | — | — |
| 88/100 | 4.9★ (770+) | 34+ | — | — | — | |
| 84/100 | 5.0★ (960+) | 10+ | — | — | — | |
| 81/100 | 4.8★ (1,025+) | 66+ | — | — | — |
Markool Heating Cooling Plumbing as a Indoor Air Quality provider
Frederick, MD Indoor Air Quality · #4 of 4 · NATE-certified · 10+ yrs
Markool lists NATE-certified technicians on staff. Markool notes Carrier Factory Authorized Dealer status. Markool advertises in-duct UV-C and ERV/HRV ventilators. Markool offers free estimates and financing options. Markool's Frederick location suits humid summers and variable winters affecting indoor humidity.
Whole-home IAQ installs and assessments serving Frederick, MD, focused on in-duct and mechanical solutions. NATE-certified technicians are listed on the team, with Carrier Factory Authorized Dealer access. In-duct UV-C and ERV/HRV ventilation systems are named on the site. Free estimates and financing are advertised for IAQ projects.
Frederick, MD Indoor Air Quality average is 83/100. Ranks #4 of 4 listed Indoor Air Quality providers in Frederick, MD.
| Signal | Markool Heating Cooling Plumbing | Frederick avg | Delta |
|---|---|---|---|
| Vouched Score | 79/100 | 82/100 | -4 vs avg |
| Google rating | 4.9★ | 4.9★ | matches city average |
| Review volume | 575+ | 835+ | -258 vs avg |
| Years in business | 10+ | 30+ | -20 vs avg |
- High Google rating (4.9★ across 575+ reviews)
- Long-established (10+ years in business)
- Authorized Carrier Factory Authorized Dealer
- NATE-certified technicians
- Emergency response: 24/7
- Financing available
- Free estimates
- You want manufacturer-warranty installation work
- You need to finance the work
- You want a top-rated provider with substantial review history (4.9★, 575+ reviews)
- You want NATE-certified technicians
- You want a BBB-rated firm specifically
| Provider | Vouched | Years | BBB | Yelp | Our picks | |
|---|---|---|---|---|---|---|
Markool Heating Cooling Plumbing (this company) |
79/100 | 4.9★ (575+) | 10+ | — | — | — |
| 85/100 | 4.9★ (770+) | 34+ | — | — | Best for UV-C Sterilization Best for Humidity Control |
|
| 84/100 | 4.8★ (1,025+) | 66+ | — | — | — | |
| 82/100 | 5.0★ (960+) | 10+ | — | — | — |
Markool Heating Cooling Plumbing as a Duct Cleaning provider
Frederick, MD Duct Cleaning · #3 of 3 · NATE-certified · 10+ yrs
Free estimates and financing options are listed on Markool's website. Markool states NATE-certified technicians staff their teams. Markool is a Carrier Factory Authorized Dealer, per the site. Frederick's humid summers and cold winters increase HVAC demand locally, and Markool notes experience servicing those seasonal loads.
Duct cleaning for residential and commercial HVAC systems in Frederick, MD. NATE-certified technicians, per their site. Free estimates and financing available, per their website. Founded 2016, showing 10+ years of local HVAC operations.
Frederick, MD Duct Cleaning average is 81/100. Ranks #3 of 3 listed Duct Cleaning providers in Frederick, MD.
| Signal | Markool Heating Cooling Plumbing | Frederick avg | Delta |
|---|---|---|---|
| Vouched Score | 78/100 | 81/100 | -3 vs avg |
| Google rating | 4.9★ | 4.9★ | matches city average |
| Review volume | 575+ | 650+ | -74 vs avg |
| Years in business | 10+ | 18+ | -8 vs avg |
- High Google rating (4.9★ across 575+ reviews)
- Long-established (10+ years in business)
- NATE-certified technicians
- Emergency response: 24/7
- Financing available
- Free estimates
- You need commercial duct cleaning
- You need to finance the work
- You have a commercial property
- You want a top-rated provider with substantial review history (4.9★, 575+ reviews)
- You want NATE-certified technicians
- You want a BBB-rated firm specifically
| Provider | Vouched | Years | BBB | Yelp | Our picks | |
|---|---|---|---|---|---|---|
Markool Heating Cooling Plumbing (this company) |
78/100 | 4.9★ (575+) | 10+ | — | — | — |
| 85/100 | 4.9★ (770+) | 34+ | — | — | Best for Mold & Air Quality | |
| 80/100 | 4.9★ (600+) | 9+ | — | — | Best for Dryer Vent Cleaning |
Markool Heating Cooling Plumbing as a Emergency AC Repair provider
Frederick, MD Emergency AC Repair · #5 of 5 · NATE-certified · 10+ yrs
24/7 emergency response is advertised on Markool's website. Carrier Factory Authorized Dealer status is listed. NATE-certified technicians are noted across service pages. Frederick's hot summers increase urgent cooling demand, and Markool lists emergency coverage for the area.
Emergency AC repair and HVAC service in Frederick, MD. NATE-certified technicians are listed on their site. Carrier Factory Authorized Dealer status is noted. Twenty-ten-plus years in business are reported and 24/7 emergency response is advertised.
Frederick, MD Emergency AC Repair average is 81/100. Ranks #5 of 5 listed Emergency AC Repair providers in Frederick, MD.
| Signal | Markool Heating Cooling Plumbing | Frederick avg | Delta |
|---|---|---|---|
| Vouched Score | 78/100 | 81/100 | -3 vs avg |
| Google rating | 4.9★ | 4.9★ | matches city average |
| Review volume | 575+ | 780+ | -203 vs avg |
| Years in business | 10+ | 42+ | -32 vs avg |
- High Google rating (4.9★ across 575+ reviews)
- Long-established (10+ years in business)
- Authorized Carrier Factory Authorized Dealer
- NATE-certified technicians
- Emergency response: 24/7
- Financing available
- Free estimates
- You need after-hours AC repair
- You need weekend & holiday AC repair
- You need same-day or after-hours service
- You want manufacturer-warranty installation work
- You need to finance the work
- You want a BBB-rated firm specifically
| Provider | Vouched | Years | BBB | Yelp | Our picks | |
|---|---|---|---|---|---|---|
Markool Heating Cooling Plumbing (this company) |
78/100 | 4.9★ (575+) | 10+ | — | — | Best NATE-Certified Shop |
| 84/100 | 4.9★ (770+) | 34+ | — | — | — | |
| 81/100 | 5.0★ (960+) | 10+ | — | — | — | |
| 81/100 | 4.8★ (1,025+) | 66+ | — | — | — |
Markool Heating Cooling Plumbing as a Mini-Split Installation provider
Frederick, MD Mini-Split Installation · #3 of 5 · NATE-certified · 10+ yrs
Markool specializes in ductless mini-split installations with Carrier systems. Markool lists NATE-certified technicians on its site. Markool is an ACCA member and cites over 20 years industry experience. Markool's service area suits Frederick's humid summers and cold winters.
Ductless mini-split installation serving Frederick, MD. NATE-certified technicians, per the company website. Carrier Factory Authorized Dealer status, per their site. Free estimates and financing available (advertised), with emergency response available (advertised).
At the Frederick, MD Mini-Split Installation average (78/100). Ranks #3 of 5 listed Mini-Split Installation providers in Frederick, MD.
| Signal | Markool Heating Cooling Plumbing | Frederick avg | Delta |
|---|---|---|---|
| Vouched Score | 78/100 | 78/100 | matches city average |
| Google rating | 4.9★ | 4.9★ | matches city average |
| Review volume | 575+ | 780+ | -203 vs avg |
| Years in business | 10+ | 42+ | -32 vs avg |
- High Google rating (4.9★ across 575+ reviews)
- Long-established (10+ years in business)
- Authorized Carrier Factory Authorized Dealer
- NATE-certified technicians
- Emergency response: 24/7
- Financing available
- Free estimates
- 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 | |
|---|---|---|---|---|---|---|
Markool Heating Cooling Plumbing (this company) |
78/100 | 4.9★ (575+) | 10+ | — | — | — |
| 81/100 | 4.9★ (770+) | 34+ | — | — | — | |
| 79/100 | 5.0★ (960+) | 10+ | — | — | — | |
| 78/100 | 4.8★ (1,025+) | 66+ | — | — | — |
Markool Heating Cooling Plumbing as a Furnace Repair provider
Frederick, MD Furnace Repair · #5 of 5 · NATE-certified · 10+ yrs
Markool highlights specialist-level furnace repair work focused on diagnostic outcomes. Markool advertises NATE-certified technicians and Carrier Factory Authorized Dealer status. Markool lists emergency service available day and night for no-heat calls. Markool notes free estimates and financing options on its site. Local winters in Frederick increase demand for rapid no-heat response and heat-system diagnostics.
Furnace repair and diagnostics in Frederick, focused on emergency no-heat response. NATE-certified technicians are listed on the company website. Carrier Factory Authorized Dealer status is noted for brand-specific service access. Emergency service is available, with the company listing coverage day and night.
Frederick, MD Furnace Repair average is 79/100. Ranks #5 of 5 listed Furnace Repair providers in Frederick, MD.
| Signal | Markool Heating Cooling Plumbing | Frederick avg | Delta |
|---|---|---|---|
| Vouched Score | 75/100 | 79/100 | -4 vs avg |
| Google rating | 4.9★ | 4.9★ | matches city average |
| Review volume | 575+ | 780+ | -203 vs avg |
| Years in business | 10+ | 42+ | -32 vs avg |
- High Google rating (4.9★ across 575+ reviews)
- Long-established (10+ years in business)
- Authorized Carrier Factory Authorized Dealer
- NATE-certified technicians
- Emergency response: 24/7
- Financing available
- Free estimates
- Specializes in furnace repair
- You need no-heat / emergency furnace repair
- You need furnace tune-up & maintenance
- You need commercial furnace 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 | |
|---|---|---|---|---|---|---|
Markool Heating Cooling Plumbing (this company) |
75/100 | 4.9★ (575+) | 10+ | — | — | Best for Commercial Furnace Repair Best NATE-Certified Shop |
| 84/100 | 4.9★ (770+) | 34+ | — | — | — | |
| 81/100 | 4.8★ (1,025+) | 66+ | — | — | — | |
| 79/100 | 5.0★ (960+) | 10+ | — | — | — |
Markool Heating Cooling Plumbing as a Furnace Replacement provider
Frederick, MD Furnace Replacement · #5 of 5 · NATE-certified · 10+ yrs
Furnace replacement work is highlighted, with full-system changeouts noted on the site. Markool lists Carrier Factory Authorized Dealer status and Carrier product access. The team states NATE-certified technicians and over twenty years of combined experience. Frederick's cold winters make correct combustion commissioning and right-sizing especially important. Reviewers report fast repairs and responsive crews after service visits.
Furnace replacement and full-system changeouts in Frederick, MD, for residential and commercial properties. NATE-certified technicians are on staff, per their site, with more than 20 years collective experience. Carrier Factory Authorized Dealer access provides trained installers and Carrier product lines. Emergency service is available (24/7 advertised) and free estimates with financing are listed.
Frederick, MD Furnace Replacement average is 79/100. Ranks #5 of 5 listed Furnace Replacement providers in Frederick, MD.
| Signal | Markool Heating Cooling Plumbing | Frederick avg | Delta |
|---|---|---|---|
| Vouched Score | 75/100 | 79/100 | -4 vs avg |
| Google rating | 4.9★ | 4.9★ | matches city average |
| Review volume | 575+ | 780+ | -203 vs avg |
| Years in business | 10+ | 42+ | -32 vs avg |
- High Google rating (4.9★ across 575+ reviews)
- Long-established (10+ years in business)
- Authorized Carrier Factory Authorized Dealer
- NATE-certified technicians
- Emergency response: 24/7
- Financing available
- Free estimates
- You need furnace + AC system replacement
- You need same-day furnace replacement
- You need same-day or after-hours service
- You want manufacturer-warranty installation work
- You need to finance the work
- You want a BBB-rated firm specifically
| Provider | Vouched | Years | BBB | Yelp | Our picks | |
|---|---|---|---|---|---|---|
Markool Heating Cooling Plumbing (this company) |
75/100 | 4.9★ (575+) | 10+ | — | — | Best NATE-Certified Installer |
| 85/100 | 4.9★ (770+) | 34+ | — | — | Best Manufacturer-Authorized Installer | |
| 81/100 | 4.8★ (1,025+) | 66+ | — | — | — | |
| 78/100 | 5.0★ (960+) | 10+ | — | — | — |
Markool Heating Cooling Plumbing as a AC Replacement provider
Frederick, MD AC Replacement · NATE-certified · 10+ yrs
Markool Heating Cooling Plumbing lists central AC replacements and full-system changeouts. Markool is a Carrier Factory Authorized Dealer. Markool's technicians are NATE-certified. Markool notes emergency response available 24/7 for Maryland heat and humidity. Local reviewers mention quick repairs and thorough maintenance plan work.
Central AC replacements and full-system changeouts in Frederick, MD. Carrier Factory Authorized Dealer with access to Carrier training and parts. NATE-certified technicians and 10+ years in business, per their site.
| Signal | Markool Heating Cooling Plumbing | Frederick avg | Delta |
|---|---|---|---|
| Google rating | 4.9★ | 4.9★ | matches city average |
| Review volume | 575+ | 780+ | -203 vs avg |
| Years in business | 10+ | 42+ | -32 vs avg |
- High Google rating (4.9★ across 575+ reviews)
- Long-established (10+ years in business)
- You want a top-rated provider with substantial review history (4.9★, 575+ reviews)
- You want a BBB-rated firm specifically
| Provider | Vouched | Years | BBB | Yelp | Our picks | |
|---|---|---|---|---|---|---|
Markool Heating Cooling Plumbing (this company) |
— | 4.9★ (575+) | 10+ | — | — | — |
| — | 4.9★ (770+) | 34+ | — | — | — | |
| — | 4.8★ (560+) | 89+ | — | — | — | |
| — | 5.0★ (960+) | 10+ | — | — | — |
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.
- Duct Work — Ductwork inspection, sealing, and replacement — addresses leakage, undersized runs, and uneven room temperatures.
Service area
Published pricing
Maintenance plans
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Maintenance Plan
As published: Maintenance Plan"…vices Commercial HVAC Air Duct Cleaning Financing Maintenance Plan Specials About Service Area Reviews Blog Meet the…"
Estimates
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Free estimates
As published: Free estimates"…r professional team and great Carrier products to free estimates and competitive pricing, we design our full suite…"
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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Does Markool Heating Cooling Plumbing do AC Replacement in Frederick, MD?
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Profile last updated July 20, 2026.