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Diamond Mechanical LLCHVAC contractor in Exeter, NH

Diamond Mechanical LLC is an HVAC contractor at 388 NH-125 Suite 1, Brentwood, NH 03833, ranked #9 of 336 HVAC contractors in Exeter and rated 4.5 from 83 Google reviews. Open 24 hours a day, 7 days a week.

Exeter, NHUpdated 0 paid placements in any rankingHow we rank

Call (603) 580-4844Website ↗

Key facts

Key facts about Diamond Mechanical LLC
Address388 NH-125 Suite 1, Brentwood, NH 03833, Exeter, NHGet directions
Phone(603) 580-4844
Websitediamondmechanicalnh.com
HoursOpen 24 hours, 7 days a week
Google rating4.5 from 83 Google reviews

Trades

Each trade shows the evidence we matched it on.

  • HVACmain tradeGoogle main category

Service area

Serves Exeter and 11 towns within 25 miles: Kingston, Sandown, Newmarket, Stratham Station, Chester, Hampstead, Durham, Plaistow, Atkinson, Hampton and Seabrook.

Based in Exeter, NHView on map

Opening hours

Opening hours for Diamond Mechanical LLC
DayHours
MondayOpen 24 hours
TuesdayOpen 24 hours
WednesdayOpen 24 hours
ThursdayOpen 24 hours
FridayOpen 24 hours
SaturdayOpen 24 hours
SundayOpen 24 hours
  • Open 24/7
  • Open evenings — no
  • Open Saturdays
  • Open Sundays
  • Emergency service

Typical heating and cooling prices

Typical heating and cooling prices
JobLowTypicalHigh
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

Diamond Mechanical LLC compared with nearby businesses
BusinessRankCR ScoreGoogle ratingLicense verifiedSaturdaySundayDistance away
Diamond Mechanical LLC (this business)—604.5 (83)—YesYes
NextGen Aire#7604.8 (271)—YesYes13.5 mi
Northeast Heating & Cooling#8605.0 (449)—YesYes17.3 mi
Morris Plumbing, Heating & Air Conditioning#10605.0 (582)—YesYes23.9 mi

See all 336 ranked HVAC contractors in Exeter

Reviews

ContractorsRanked reviews

No ContractorsRanked reviews yet

Google

4.5from 83 Google reviews

Hired Diamond Mechanical LLC? Write a review

Questions about Diamond Mechanical LLC

How is Diamond Mechanical LLC ranked in Exeter?

Diamond Mechanical LLC is ranked #9 of 336 HVAC contractors in Exeter by CR Score, with 60 out of 100 as of October 2026. The score weighs reputation, credentials, review volume, recency, availability, trade focus, proximity, claimed profile, partnered and ContractorsRanked reviews. No business can pay to change its rank.

What are Diamond Mechanical LLC’s hours?

Diamond Mechanical LLC 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 Diamond Mechanical LLC serve?

Serves Exeter and 11 towns within 25 miles: Kingston, Sandown, Newmarket, Stratham Station, Chester, Hampstead, Durham, Plaistow, Atkinson, Hampton and Seabrook. 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 Diamond Mechanical LLC?

Diamond Mechanical LLC has a rating of 4.5 from 83 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 Diamond Mechanical LLC?

Call Diamond Mechanical LLC on (603) 580-4844. The business is at 388 NH-125 Suite 1, Brentwood, NH 03833, Exeter, NH. Its website is linked in the key facts on this page. Ask for a written estimate before any work starts.

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Claiming is free. Correct your hours, trades and service area. The CR Score is recalculated from corrected data; payment never changes it.

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