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ContractorsRanked

Best HVAC Contractors in Key Largo, FL (2026)

16 HVAC contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →

The short answer

  1. 1

    Best overall in Key Largo: SUB ZERO AIR, CR Score 94/100; 5.0★ from 177 Google reviews; open 24/7.

  2. 3

    Best for emergencies (open 24/7): Air Conditioning On Call, posts 24/7 hours; ranked #3 of 16.

  3. 10

    Most-reviewed: Rocket Cooling, 1,040 Google reviews at 4.8★, the most of 16 ranked; ranked #10.

Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank

16 Key Largo HVAC contractors are ranked here by CR Score, from 8 published factors. 8 are open 24/7, 12 open Saturdays and 11 open Sundays, based on posted hours. The median Google rating is 5.0★ across 16 rated businesses.

Top 10 HVAC contractors in Key Largo at a glance

Top 10 HVAC contractors in Key Largo at a glance
RankBusinessCR ScoreGoogle ratingBased inHoursBest for
1SUB ZERO AIR945.0★ (177)Key Largo24/7Overall
2Irwin's Air925.0★ (412)Key LargoSat · Sun · Evenings—
3Air Conditioning On Call914.9★ (54)Key Largo24/7Emergencies
4Rex Air904.9★ (828)Islamorada, 11 mi awaySat · Sun · Evenings—
5Upper Keys A/C885.0★ (10)Key Largo24/7—
6Key Largo Air Conditioning & Heating874.7★ (15)Key Largo24/7—
7Island Air Control854.9★ (10)Islamorada, 11 mi away24/7—
8Air Now845.0★ (18)Key Largo24/7—
9Irwin's Air835.0★ (39)Islamorada, 16 mi awaySat · Sun · Evenings—
10Rocket Cooling834.8★ (1,040)Islamorada, 7 mi away—Most reviews

The 16 best HVAC contractors in Key Largo, 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.

  1. Ranked #1 in Key Largo

    #1 SUB ZERO AIR

    Based in Key Largo

    94/100CR Score

    Ranked #1 because of its Google rating and availability: 5.0★ from 177 Google reviews, open 24/7.

    • 5.0★ from 177 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    101425 Overseas Hwy Ste 300, Key Largo, FL 33037
    View profile for SUB ZERO AIR(305) 852-2100

  2. #2 Irwin's Air

    Based in Key Largo

    92/100CR Score

    Ranked #2 because of its Google rating and trade focus: 5.0★ from 412 Google reviews, listed on Google as “HVAC contractor”.

    • 5.0★ from 412 Google reviews
    Hours
    Mon–Sun 7 AM–9 PM
    Address
    103301 Overseas Hwy, Key Largo, FL 33037
    View profile for Irwin's Air(305) 423-0400

  4. #4 Rex Air

    Based in Islamorada, 11 mi away

    90/100CR Score

    Ranked #4 because of its Google rating and trade focus: 4.9★ from 828 Google reviews, listed on Google as “HVAC contractor”.

    • 4.9★ from 828 Google reviews
    Hours
    Mon–Fri 7:30 AM–9 PM · Sat–Sun 8 AM–9 PM
    Address
    87805 Overseas Hwy, Islamorada, FL 33036
    View profile for Rex Air(305) 852-8230

  8. #8 Air Now

    Based in Key Largo

    84/100CR Score

    Ranked #8 because of its Google rating and trade focus: 5.0★ from 18 Google reviews, listed on Google as “Air conditioning contractor”.

    • 5.0★ from 18 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    98980 Overseas Hwy Unit 5, Key Largo, FL 33037
    View profile for Air Now(305) 684-7971

  9. #9 Irwin's Air

    Based in Islamorada, 16 mi away

    83/100CR Score

    Ranked #9 because of its Google rating and trade focus: 5.0★ from 39 Google reviews, listed on Google as “HVAC contractor”.

    • 5.0★ from 39 Google reviews
    Hours
    Mon–Sun 7 AM–9 PM
    Address
    82205 Overseas Hwy Storefront A, Islamorada, FL 33036
    View profile for Irwin's Air(305) 423-0400

  10. #10 Rocket Cooling

    Based in Islamorada, 7 mi away

    83/100CR Score

    Ranked #10 because of its Google rating and review volume: 4.8★ from 1,040 Google reviews, the most Google reviews on this list (1,040).

    • 4.8★ from 1,040 Google reviews
    Hours
    Mon–Fri 8 AM–5 PM · Sat–Sun closed
    Address
    171 Hood Ave, Tavernier, FL 33070
    View profile for Rocket Cooling(305) 697-6007

  13. #13 Quality Comfort Experts

    Based in Islamorada, 10 mi away

    81/100CR Score

    Ranked #13 because of its Google rating and trade focus: 5.0★ from 36 Google reviews, listed on Google as “HVAC contractor”.

    • 5.0★ from 36 Google reviews
    Hours
    Mon–Fri 8 AM–5 PM · Sat 8 AM–4 PM · Sun closed
    Address
    89015 Overseas Hwy Ste 5, Tavernier, FL 33070
    View profile for Quality Comfort Experts(305) 741-7855

Also serving Key Largo

8 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.

Unranked HVAC contractors serving Key Largo
BusinessGoogle ratingDistance
Air Conditioning On CallIn Key Largo
Aire by Design14 mi
All Brands Corp. AC Inc.5.0★ (2)In Key Largo
All RD Construction25 mi
Florida City AC Repair Services1.0★ (1)25 mi
Garrett's A/C And Refrigeration5.0★ (1)In Key Largo
General HVAC Co3.0★ (2)17 mi
Irwin's Air5.0★ (2)In Key Largo

How much do HVAC contractors cost in Key Largo?

National price ranges in USD, not adjusted for Key Largo. Each row names its basis and the month we checked it.

How much do HVAC contractors cost in Key Largo?
JobLowTypicalHighBasisChecked
AC replacement$3,887$5,978$8,073Per system, installed (unit plus labor); typical range of customer-reported jobs. US national rangeOctober 2026
Furnace replacement$2,823$4,814$6,896Per system, installed; typical range of customer-reported jobs. US national rangeOctober 2026

How to check an HVAC contractor's license in Florida

In Florida, Florida Construction Industry Licensing Board (DBPR) licenses Certified or registered air conditioning (CAC, RA) and mechanical (CMC, RM) contractors.

  1. Search the business name or license number on the Florida Construction Industry Licensing Board (DBPR) license lookup.
  2. Check that the status is active and the name matches the contract or truck.
  3. 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 Florida

In Florida, air conditioning calls peak in the hottest summer months. Spring is the easiest time to book a tune-up or replacement, before the first heat wave.

How we ranked Key Largo HVAC contractors

We scored 16 Key Largo 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.

Read the full method: formula, sources and exclusions

CR Score factors and weights
FactorWeightComputed fromIn Key Largo data
Reputation35%Bayesian-adjusted Google star ratingMeasured
Credentials15%Active state license 0.6, bond 0.2, workers’ comp 0.2Not yet collected
Review volume10%log10(reviews + 1) against the list maximumMeasured
Recency10%Share of reviews from the last 12 monthsNot yet collected
Availability10%Weekly open hours, Saturday, Sunday, 24/7 or same-dayMeasured
Trade focus10%Google main category 1.0, business name 0.7, additional category 0.5Measured
Proximity5%1.0 when based in the city, falling to 0 at the trade’s radiusMeasured
Completeness5%Website, photos, description, hours, claimed profile (0.2 each)Measured

HVAC contractors in Key Largo: frequently asked questions

Who is the best HVAC contractor in Key Largo?

By CR Score, the highest-ranked HVAC contractor in Key Largo, FL is SUB ZERO AIR with a CR Score of 94/100. It has 5.0★ from 177 Google reviews. It is open 24/7. Irwin's Air (#2) and Air Conditioning On Call (#3) follow. We ranked 16 HVAC contractors on 8 factors, last updated October 22, 2026.

How many HVAC contractors are there in Key Largo?

ContractorsRanked ranks 16 HVAC contractors serving Key Largo, FL. 8 of them are based in Key Largo; the rest serve it from nearby towns. Another 8 within 25 mi are listed but not ranked yet. Counts are as of October 2026.

Which HVAC contractors in Key Largo are open 24/7?

8 ranked HVAC contractors in Key Largo post 24/7 hours. The highest-ranked are SUB ZERO AIR (#1), Air Conditioning On Call (#3) and Upper Keys A/C (#5). Hours come from each business's Google listing as of October 2026, so call to confirm.

Which HVAC contractors in Key Largo work on weekends?

12 of 16 ranked HVAC contractors post Saturday hours and 11 post Sunday hours. The highest-ranked open Saturdays are SUB ZERO AIR (#1), Irwin's Air (#2) and Air Conditioning On Call (#3). Posted hours are office hours; crews may book weekend jobs separately.

How do I check an HVAC contractor's license in Florida?

In Florida, Florida Construction Industry Licensing Board (DBPR) handles licensing and covers Certified or registered air conditioning (CAC, RA) and mechanical (CMC, RM) contractors. Search the business or license number at https://www.myfloridalicense.com/wl11.asp.

How much does ac replacement cost in Key Largo?

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 Key Largo. Prices were last checked October 2026. Get at least two written quotes before you hire.

What Google rating do Key Largo HVAC contractors have?

The median Google rating among 16 rated HVAC contractors in Key Largo is 5.0★, with a median of 37 reviews. Rocket Cooling has the most, 1,040 reviews, and ranks #10. 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 Key Largo?

In Florida, air conditioning calls peak in the hottest summer months. Spring is the easiest time to book a tune-up or replacement, before the first heat wave.

Update log for Key Largo

  1. October 2026: CR Scores recalculated for 16 hvac contractors serving Key Largo.

More HVAC contractors and Key Largo pages

Other trades in Key Largo