20 HVAC contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Defiance: Ascend Mechanical/JMS Services, CR Score 63/100; 4.7★ from 340 Google reviews; open 24/7.
Best for emergencies (open 24/7): Rsm Services, posts 24/7 hours; ranked #2 of 20.
Most-reviewed: RSM Services, 181 Google reviews at 5.0★, the most of 20 ranked after Ascend Mechanical/JMS Services; ranked #3.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
20 Defiance HVAC contractors are ranked here by CR Score, from ten published factors. 6 are open 24/7, 9 open Saturdays and 6 open Sundays, based on posted hours. The median Google rating is 4.5★ across 20 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Ascend Mechanical/JMS Services | 63 | 4.7★ (340) | Bryan, 17 mi away | 24/7 | Overall |
| 2 | Rsm Services | 61 | 5.0★ (99) | Bryan, 16 mi away | 24/7 | Emergencies |
| 3 | RSM Services | 61 | 5.0★ (181) | Wauseon, 23 mi away | 24/7 | Most reviews |
| 4 | Scott Wagner Plumbing & Heating | 60 | 4.8★ (146) | Defiance | — | — |
| 5 | Jay's Heating and Cooling | 58 | 4.5★ (72) | Bryan, 20 mi away | 24/7 | — |
| 6 | Fitzenrider | 58 | 4.2★ (30) | Defiance | — | — |
| 7 | 4 Star Plumbing, Heating & Air Conditioning | 56 | 4.9★ (117) | Bryan, 19 mi away | — | — |
| 8 | Von Deylen Plumbing & Heating Inc. | 56 | 4.5★ (146) | Napoleon, 14 mi away | — | — |
| 9 | Morris Heating, Air Conditioning & Plumbing | 55 | 3.5★ (28) | Defiance | Sat | — |
| 10 | Minnick Heating & Air Conditioning | 54 | 4.2★ (12) | Napoleon, 13 mi away | Sat · Sun · Evenings | — |
Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.
Ranked #1 because of its Google rating and review volume: 4.7★ from 340 Google reviews, the most in Defiance.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Bryan, 16 mi away
Ranked #2 because of its Google rating and trade focus: 5.0★ from 99 Google reviews, listed on Google as “Heating contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Wauseon, 23 mi away
Ranked #3 because of its Google rating and trade focus: 5.0★ from 181 Google reviews, listed on Google as “HVAC contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Defiance
Ranked #4 because of its Google rating and trade focus: 4.8★ from 146 Google reviews, listed on Google as “HVAC contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Bryan, 20 mi away
Ranked #5 because of its Google rating and trade focus: 4.5★ from 72 Google reviews, listed on Google as “HVAC contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Defiance
Ranked #6 because of its Google rating and trade focus: 4.2★ from 30 Google reviews, listed on Google as “HVAC contractor”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Based in Bryan, 19 mi away
Ranked #7 because of its Google rating and trade focus: 4.9★ from 117 Google reviews, listed on Google as “HVAC contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Napoleon, 14 mi away
Ranked #8 because of its Google rating and trade focus: 4.5★ from 146 Google reviews, listed on Google as “HVAC contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Defiance
Ranked #9 because of its Google rating and trade focus: 3.5★ from 28 Google reviews, listed on Google as “HVAC contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Napoleon, 13 mi away
Ranked #10 because of its Google rating and trade focus: 4.2★ from 12 Google reviews, listed on Google as “HVAC contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Bryan, 19 mi away
Ranked #11 because of its Google rating and trade focus: 5.0★ from 6 Google reviews, listed on Google as “HVAC contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Bryan, 17 mi away
Ranked #12 because of its Google rating and trade focus: 4.5★ from 62 Google reviews, listed on Google as “Air conditioning contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Bryan, 17 mi away
Ranked #13 because of its Google rating and trade focus: 4.0★ from 68 Google reviews, listed on Google as “HVAC contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Wauseon, 22 mi away
Ranked #14 because of its Google rating and trade focus: 5.0★ from 5 Google reviews, listed on Google as “HVAC contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Napoleon, 14 mi away
Ranked #15 because of its Google rating and trade focus: 3.7★ from 7 Google reviews, listed on Google as “HVAC contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Napoleon, 15 mi away
Ranked #16 because of its Google rating and trade focus: 5.0★ from 10 Google reviews, listed on Google as “Heating contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Wauseon, 21 mi away
Ranked #17 because of its Google rating and trade focus: 4.4★ from 9 Google reviews, listed on Google as “Heating contractor”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Based in Wauseon, 22 mi away
Ranked #18 because of its Google rating and trade focus: 4.2★ from 26 Google reviews, listed on Google as “HVAC contractor”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Wauseon, 20 mi away
Ranked #19 because of its Google rating and trade focus: 4.1★ from 9 Google reviews, listed on Google as “Plumber”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Based in Wauseon, 21 mi away
Ranked #20 because of its Google rating and trade focus: 4.2★ from 30 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
9 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 |
|---|---|---|
| Bergstedt Building LLC | 24 mi | |
| Fraas Heat AC & Plumbing | 5.0★ (1) | In Defiance |
| GRANT HVAC, LLC. | 16 mi | |
| Hammontree's Heating and Cooling | 5.0★ (2) | 21 mi |
| Kime Plumbing & Heating | 5.0★ (1) | In Defiance |
| Paul Voigt & Associates Inc | 5.0★ (2) | In Defiance |
| Poynter Plumbing & Heating | 3.0★ (1) | 17 mi |
| Standard Plumbing & Heating | 14 mi | |
| Sterling Mechanical LLC | 5.0★ (2) | 21 mi |
National price ranges in USD, not adjusted for Defiance. 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 |
In Ohio, Ohio Construction Industry Licensing Board licenses Commercial HVAC and refrigeration contractor licenses.
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
In Ohio, furnace and heat pump calls peak in the coldest winter weeks and AC calls in summer heat waves. Spring and fall are the easiest times to book maintenance or a replacement.
We scored 20 Defiance HVAC contractors on ten 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. A business with no Google reviews scores zero on rating, review volume and recency. Other unknown factors are left out, 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 Defiance data |
|---|---|---|---|
| Reputation | 25% | Google star rating, adjusted for how many reviews back it | Measured |
| Credentials | 15% | Active state license, bond and workers’ comp on file | Not yet collected |
| Review volume | 10% | Number of Google reviews, compared with the most-reviewed business on the list | Measured |
| Recency | 5% | Share of reviews from the last 12 months | Not yet collected |
| Availability | 5% | Weekly open hours, Saturday, Sunday, 24/7 or same-day | Measured |
| Trade focus | 10% | How clearly the business does this trade (its Google category and name) | Measured |
| Proximity | 5% | Based in the city scores highest, less the farther away it is | Measured |
| Claimed profile | 10% | The business has claimed its ContractorsRanked profile (free or paid earn the same) | Measured |
| Partnered | 5% | The business links to ContractorsRanked from its own website with our badge, checked periodically | Measured |
| ContractorsRanked reviews | 10% | Verified customer reviews collected by ContractorsRanked: their rating and how many there are | Measured |