Warner ServiceHVAC contractor in Frederick, MD
Warner Service is an HVAC contractor at 217 Monroe Ave, Frederick, MD 21701, ranked #5 of 272 HVAC contractors in Frederick and rated 4.8 from 537 Google reviews. Open 24 hours a day, 7 days a week.
Frederick, MDUpdated 0 paid placements in any rankingHow we rank
Key facts
| Address | 217 Monroe Ave, Frederick, MD 21701Get directions |
|---|---|
| Phone | (301) 200-9774 |
| Website | warnerservice.com |
| Hours | Open 24 hours, 7 days a week |
| Google rating | 4.8 from 537 Google reviews |
Service area
Serves Frederick and 11 towns within 25 miles: Spring Ridge, Ballenger Creek, Walkersville, Urbana, Green Valley, Linganore, Mount Airy, Damascus, Clarksburg, Brunswick and Thurmont.
Based in Frederick, MDView on map
Opening hours
| Day | Hours |
|---|---|
| Monday | Open 24 hours |
| Tuesday | Open 24 hours |
| Wednesday | Open 24 hours |
| Thursday | Open 24 hours |
| Friday | Open 24 hours |
| Saturday | Open 24 hours |
| Sunday | Open 24 hours |
- Open 24/7
- Open evenings — no
- Open Saturdays
- Open Sundays
- Emergency service
Typical heating and cooling prices
| Job | Low | Typical | High |
|---|---|---|---|
| AC replacementPer system, installed (unit plus labor); typical range of customer-reported jobs. US national range | $3,887 | $5,978 | $8,073 |
| Furnace replacementPer system, installed; typical range of customer-reported jobs. US national range | $2,823 | $4,814 | $6,896 |
Market ranges for the trade, checked October 2026, not a quote from this business. Ask for a written estimate.
Compare nearby HVAC contractors
| Business | Rank | CR Score | Google rating | License verified | Saturday | Sunday | Distance away |
|---|---|---|---|---|---|---|---|
| Warner Service (this business) | — | 92 | 4.8 (537) | — | Yes | Yes | |
| Markool Heating Cooling Plumbing | #3 | 93 | 4.9 (547) | — | Yes | Yes | 5.4 mi |
| Smock Heating & Air | #4 | 92 | 5.0 (1,623) | — | Yes | Yes | 1.2 mi |
| United Air Temp | #6 | 92 | 4.7 (928) | — | Yes | Yes | 5.5 mi |
Questions about Warner Service
How is Warner Service ranked in Frederick?
Warner Service is ranked #5 of 272 HVAC contractors in Frederick by CR Score, with 92 out of 100 as of October 2026. The score weighs reputation, credentials, review volume, recency, availability, trade focus, proximity and profile completeness. No business can pay to change its rank.
What are Warner Service’s hours?
Warner Service is open 24 hours a day, 7 days a week. Its listed hours are Open 24 hours, 7 days a week. On Saturdays it is open Open 24 hours, and on Sundays Open 24 hours. Hours come from the business listing; holiday hours may differ.
What areas does Warner Service serve?
Serves Frederick and 11 towns within 25 miles: Spring Ridge, Ballenger Creek, Walkersville, Urbana, Green Valley, Linganore, Mount Airy, Damascus, Clarksburg, Brunswick and Thurmont. The list is based on the business's location and the usual service radius for heating and cooling. Confirm your address is covered when you call.
What do Google reviews say about Warner Service?
Warner Service has a rating of 4.8 from 537 Google reviews. The CR Score adjusts the star rating for review count, so a high rating from a few reviews counts for less than the same rating from many.
How do I contact Warner Service?
Call Warner Service on (301) 200-9774. The business is at 217 Monroe Ave, Frederick, MD 21701. Its website is linked in the key facts on this page. Ask for a written estimate before any work starts.
Own Warner Service? Claim this profile.
Claiming is free. Correct your hours, trades and service area. The CR Score is recalculated from corrected data; payment never changes it.