92/100CR Score
Ranked #1 because of its Google rating and availability: 4.6★ from 8,136 Google reviews, open 24/7.
- 4.6★ from 8,136 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 550 Forest Glen Rd, Silver Spring, MD 20901
Best HVAC Contractors in Chillum, MD (2026)
1,153 HVAC contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Chillum: Len The Plumber Heating & Air, LLC, CR Score 92/100; 4.6★ from 8,136 Google reviews; open 24/7.
- 2
Best for emergencies (open 24/7): GAC Services, posts 24/7 hours; ranked #2 of 1,153.
- 5
Most-reviewed: Michael & Son Services, 15,537 Google reviews at 4.7★, the most of 1,153 ranked; ranked #5.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
1,153 Chillum HVAC contractors are ranked here by CR Score, from 8 published factors. 336 are open 24/7, 766 open Saturdays and 523 open Sundays, based on posted hours. The median Google rating is 4.9★ across 1,153 rated businesses.
Top 10 HVAC contractors in Chillum at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Len The Plumber Heating & Air, LLC | 92 | 4.6★ (8,136) | Silver Spring, 4 mi away | 24/7 | Overall |
| 2 | GAC Services | 91 | 4.9★ (6,908) | Gaithersburg, 16 mi away | 24/7 | Emergencies |
| 3 | CroppMetcalfe | 91 | 4.8★ (7,638) | Fairfax, 15 mi away | 24/7 | — |
| 4 | NARFIX HEATING AND AIR CONDITIONING LLC | 91 | 5.0★ (293) | Silver Spring, 3 mi away | 24/7 | — |
| 5 | Michael & Son Services | 91 | 4.7★ (15,537) | Alexandria, 15 mi away | 24/7 | Most reviews |
| 6 | United Air Temp | 90 | 4.8★ (1,306) | Greenbelt, 7 mi away | 24/7 | — |
| 7 | AZA heating, cooling, plumbing & construction | 90 | 5.0★ (959) | Alexandria, 13 mi away | 24/7 | — |
| 8 | F.H. Furr Plumbing, Heating, Air Conditioning & Electrical | 90 | 4.7★ (5,985) | Rockville, 12 mi away | 24/7 | — |
| 9 | John C. Flood | 90 | 4.8★ (4,976) | Alexandria, 15 mi away | 24/7 | — |
| 10 | Krafft Service Corporation | 90 | 4.9★ (1,631) | Alexandria, 13 mi away | 24/7 | — |
The 1,153 best HVAC contractors in Chillum, ranked
Ordered by CR Score, a 0–100 score from 8 published factors. Paid placement never changes the order.
Scores below: based on 6 of 8 factors; credentials and recency not yet collected. Hatched segments mark factors we don't have yet.
#2 GAC Services
Based in Gaithersburg, 16 mi away
91/100CR ScoreRanked #2 because of its Google rating and availability: 4.9★ from 6,908 Google reviews, open 24/7.
- 4.9★ from 6,908 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 227 E Deer Park Dr, Gaithersburg, MD 20877
Based in Fairfax, 15 mi away
91/100CR ScoreRanked #3 because of its Google rating and availability: 4.8★ from 7,638 Google reviews, open 24/7.
- 4.8★ from 7,638 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 8421 Hilltop Rd, Fairfax, VA 22031
Based in Silver Spring, 3 mi away
91/100CR ScoreRanked #4 because of its Google rating and availability: 5.0★ from 293 Google reviews, open 24/7.
- 5.0★ from 293 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 9407 New Hampshire Ave, Silver Spring, MD 20903
Based in Alexandria, 15 mi away
91/100CR ScoreRanked #5 because of its Google rating and review volume: 4.7★ from 15,537 Google reviews, the most Google reviews on this list (15,537).
- 4.7★ from 15,537 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 5740 General Washington Dr, Alexandria, VA 22312
Based in Greenbelt, 7 mi away
90/100CR ScoreRanked #6 because of its Google rating and availability: 4.8★ from 1,306 Google reviews, open 24/7.
- 4.8★ from 1,306 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 7255 Hanover Pkwy Ste A, Greenbelt, MD 20770
Based in Alexandria, 13 mi away
90/100CR ScoreRanked #7 because of its Google rating and availability: 5.0★ from 959 Google reviews, open 24/7.
- 5.0★ from 959 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 5800 Quantrell Ave #1510, Alexandria, VA 22312
Based in Rockville, 12 mi away
90/100CR ScoreRanked #8 because of its Google rating and availability: 4.7★ from 5,985 Google reviews, open 24/7.
- 4.7★ from 5,985 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 685 Lofstrand Ln, Rockville, MD 20850
Based in Alexandria, 15 mi away
90/100CR ScoreRanked #9 because of its Google rating and availability: 4.8★ from 4,976 Google reviews, open 24/7.
- 4.8★ from 4,976 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 6430 General Green Way, Alexandria, VA 22312
Based in Alexandria, 13 mi away
90/100CR ScoreRanked #10 because of its Google rating and availability: 4.9★ from 1,631 Google reviews, open 24/7.
- 4.9★ from 1,631 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 5707A Edsall Rd, Alexandria, VA 22304
Based in Fairfax, 14 mi away
90/100CR ScoreRanked #11 because of its Google rating and availability: 4.9★ from 1,794 Google reviews, open 24/7.
- 4.9★ from 1,794 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 2800 Juniper St #10, Fairfax, VA 22031
#12 United Air Temp
Based in Fort Washington, 11 mi away
90/100CR ScoreRanked #12 because of its Google rating and availability: 4.8★ from 1,775 Google reviews, open 24/7.
- 4.8★ from 1,775 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 5620 St Barnabas Rd Ste 240, Fort Washington, MD 20744
Based in Clarksburg, 2 mi away
89/100CR ScoreRanked #13 because of its Google rating and availability: 4.8★ from 302 Google reviews, open 24/7.
- 4.8★ from 302 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
Based in Hyattsville, 7 mi away
89/100CR ScoreRanked #14 because of its Google rating and trade focus: 4.8★ from 8,326 Google reviews, listed on Google as “HVAC contractor”.
- 4.8★ from 8,326 Google reviews
- Hours
- Mon–Sun 8 AM–6 PM
- Address
- 3400 Sharp St, Hyattsville, MD 20785
Based in Greater Upper Marlboro, 15 mi away
89/100CR ScoreRanked #15 because of its Google rating and availability: 4.9★ from 1,421 Google reviews, open 24/7.
- 4.9★ from 1,421 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 15881 Commerce Ct, Upper Marlboro, MD 20774
Based in Silver Spring, 5 mi away
89/100CR ScoreRanked #16 because of its Google rating and availability: 4.8★ from 299 Google reviews, open 24/7.
- 4.8★ from 299 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 2412 Linden Ln, Silver Spring, MD 20910
Based in Silver Spring, 4 mi away
89/100CR ScoreRanked #17 because of its Google rating and availability: 4.8★ from 291 Google reviews, open 24/7.
- 4.8★ from 291 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 2345 Distribution Cir, Silver Spring, MD 20910
#18 Caffi Services
Based in Alexandria, 11 mi away
89/100CR ScoreRanked #18 because of its Google rating and availability: 4.9★ from 508 Google reviews, open 24/7.
- 4.9★ from 508 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 1313 Powhatan St, Alexandria, VA 22314
Based in Gaithersburg, 17 mi away
89/100CR ScoreRanked #19 because of its Google rating and availability: 4.9★ from 1,701 Google reviews, open 24/7.
- 4.9★ from 1,701 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 8000 Cessna Ave, Gaithersburg, MD 20879
Based in Washington, D.C., 6 mi away
89/100CR ScoreRanked #20 because of its Google rating and availability: 4.9★ from 205 Google reviews, open 24/7.
- 4.9★ from 205 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 100 M St SE #600, Washington, DC 20003
Based in Silver Spring, 4 mi away
89/100CR ScoreRanked #21 because of its Google rating and availability: 4.9★ from 130 Google reviews, open 24/7.
- 4.9★ from 130 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 1813 Mt Pisgah Ln, Silver Spring, MD 20903
Based in Crofton, 16 mi away
89/100CR ScoreRanked #22 because of its Google rating and availability: 4.9★ from 1,156 Google reviews, open 24/7.
- 4.9★ from 1,156 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 2142 Priest Bridge Court #6, Crofton, MD 21114
Based in Cheverly, 6 mi away
88/100CR ScoreRanked #23 because of its Google rating and availability: 4.9★ from 166 Google reviews, open 24/7.
- 4.9★ from 166 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 1712 62nd Ave, Cheverly, MD 20785
Based in Washington, D.C., 1 mi away
88/100CR ScoreRanked #24 because of its Google rating and availability: 4.4★ from 1,519 Google reviews, open 24/7.
- 4.4★ from 1,519 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 600 Gallatin St NE, Washington, DC 20017
Based in Alexandria, 12 mi away
88/100CR ScoreRanked #25 because of its Google rating and availability: 4.9★ from 440 Google reviews, open 24/7.
- 4.9★ from 440 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 3045 Colvin St, Alexandria, VA 22314
HVAC contractors ranked #26 to #50
#1 to #25 are shown in full above. Here are #26 to #50, in CR Score order; each links to its profile. We publish the top 50 of 1,153 ranked HVAC contractors here; the rest are on their profiles.
Also serving Chillum
20 more HVAC contractors within 25 mi that we can't rank yet: too few reviews, or a trade we couldn't confirm. Listed A to Z.
| Business | Google rating | Distance |
|---|---|---|
| Aardvark Concepts, LLC | In Chillum | |
| Barivo HVAC Repair Washington | 5.0★ (2) | 5 mi |
| Conrod's Plumbing Heating and A/C | 5.0★ (2) | 3 mi |
| Cora AC | 5.0★ (2) | In Chillum |
| Coreno HVAC Repair Washington | 5.0★ (2) | 5 mi |
| DC HVAC, Heating and Air Conditioning | 5.0★ (2) | 5 mi |
| DMV Mechanical | 3.0★ (2) | 3 mi |
| Helino HVAC Repair Washington | 5.0★ (2) | 6 mi |
| Heravo HVAC Repair Washington | 5.0★ (2) | 5 mi |
| JC & JC HVAC | 4.7★ (503) | 10 mi |
| JDL HVAC & Plumbing Services | 4.8★ (678) | 11 mi |
| R And R Climate Control Inc | 5.0★ (2) | 3 mi |
| R D Springer Plumbing & Heating | 5.0★ (2) | 4 mi |
| SO HVAC Squad LLC | In Chillum | |
| T & T Plumbing And Heating | 5.0★ (2) | 5 mi |
| Teravo HVAC Repair Washington | 5.0★ (2) | 5 mi |
| Vito Services | 4.7★ (1,351) | 12 mi |
| Xavino HVAC Repair Washington | 5.0★ (2) | 5 mi |
| Xoravo HVAC Repair Washington | 5.0★ (2) | 5 mi |
| Zelavo HVAC Repair Washington | 5.0★ (2) | 5 mi |
How much do HVAC contractors cost in Chillum?
National price ranges in USD, not adjusted for Chillum. Each row names its basis and the month we checked it.
| Job | Low | Typical | High | Basis | Checked |
|---|---|---|---|---|---|
| AC replacement | $3,887 | $5,978 | $8,073 | Per system, installed (unit plus labor); typical range of customer-reported jobs. US national range | October 2026 |
| Furnace replacement | $2,823 | $4,814 | $6,896 | Per system, installed; typical range of customer-reported jobs. US national range | October 2026 |
How to check an HVAC contractor's license in Maryland
In Maryland, Maryland State Board of Heating, Ventilation, Air-Conditioning and Refrigeration Contractors licenses Heating, ventilation, air conditioning and refrigeration work.
- Check that the status is active and the name matches the contract or truck.
- Ask for proof of insurance before work starts.
No chip usually means we have not matched a state record yet. Check the lookup yourself before you hire.
Guide checked October 2026. How we verify licenses
When to hire an HVAC contractor in Maryland
HVAC demand peaks in summer for cooling and in winter for heating. Spring and fall are the easiest times to book maintenance or a replacement.
How we ranked Chillum HVAC contractors
We scored 1,153 Chillum HVAC contractors on 8 factors, weighted as shown. A business is ranked when its trade is confirmed and it has 3 or more Google reviews or a claimed profile. Unknown factors are left out of the score, not counted as zero. Scores last refreshed October 22, 2026.
Paid placement never changes a rank or score. Featured businesses are paid, labelled, limited to 3 and shown above the ranking, outside it.
| Factor | Weight | Computed from | In Chillum data |
|---|---|---|---|
| Reputation | 35% | Bayesian-adjusted Google star rating | Measured |
| Credentials | 15% | Active state license 0.6, bond 0.2, workers’ comp 0.2 | Not yet collected |
| Review volume | 10% | log10(reviews + 1) against the list maximum | Measured |
| Recency | 10% | Share of reviews from the last 12 months | Not yet collected |
| Availability | 10% | Weekly open hours, Saturday, Sunday, 24/7 or same-day | Measured |
| Trade focus | 10% | Google main category 1.0, business name 0.7, additional category 0.5 | Measured |
| Proximity | 5% | 1.0 when based in the city, falling to 0 at the trade’s radius | Measured |
| Completeness | 5% | Website, photos, description, hours, claimed profile (0.2 each) | Measured |
HVAC contractors in Chillum: frequently asked questions
Who is the best HVAC contractor in Chillum?
By CR Score, the highest-ranked HVAC contractor in Chillum, MD is Len The Plumber Heating & Air, LLC with a CR Score of 92/100. It has 4.6★ from 8,136 Google reviews. It is open 24/7. GAC Services (#2) and CroppMetcalfe (#3) follow. We ranked 1,153 HVAC contractors on 8 factors, last updated October 22, 2026.
How many HVAC contractors are there in Chillum?
ContractorsRanked ranks 1,153 HVAC contractors serving Chillum, MD. Another 20 within 25 mi are listed but not ranked yet. Counts are as of October 2026.
Which HVAC contractors in Chillum are open 24/7?
336 ranked HVAC contractors in Chillum post 24/7 hours. The highest-ranked are Len The Plumber Heating & Air, LLC (#1), GAC Services (#2) and CroppMetcalfe (#3). Hours come from each business's Google listing as of October 2026, so call to confirm.
Which HVAC contractors in Chillum work on weekends?
766 of 1,153 ranked HVAC contractors post Saturday hours and 523 post Sunday hours. The highest-ranked open Saturdays are Len The Plumber Heating & Air, LLC (#1), GAC Services (#2) and CroppMetcalfe (#3). Posted hours are office hours; crews may book weekend jobs separately.
How do I check an HVAC contractor's license in Maryland?
In Maryland, Maryland State Board of Heating, Ventilation, Air-Conditioning and Refrigeration Contractors handles licensing and covers Heating, ventilation, air conditioning and refrigeration work.
How much does ac replacement cost in Chillum?
AC replacement typically costs $3,887 to $8,073, with $5,978 typical (Per system, installed (unit plus labor); typical range of customer-reported jobs. US national range). This is a national range, not adjusted for Chillum. Prices were last checked October 2026. Get at least two written quotes before you hire.
What Google rating do Chillum HVAC contractors have?
The median Google rating among 1,153 rated HVAC contractors in Chillum is 4.9★, with a median of 22 reviews. Michael & Son Services has the most, 15,537 reviews, and ranks #5. We adjust ratings for review count, so a few five-star reviews cannot top the list.
When is the best time to hire an HVAC contractor in Chillum?
HVAC demand peaks in summer for cooling and in winter for heating. Spring and fall are the easiest times to book maintenance or a replacement.
Update log for Chillum
- October 2026: CR Scores recalculated for 1,153 hvac contractors serving Chillum.
- October 2026: 11 duplicate listings merged.
More HVAC contractors and Chillum pages
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