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D/E/F Services Group, LTDHVAC contractor in Old Saybrook, CT

D/E/F Services Group, LTD is an HVAC contractor at 40 Research Pkwy, Old Saybrook, CT 06475, ranked #5 of 192 HVAC contractors in Old Saybrook and rated 4.4 from 33 Google reviews. Open 24 hours a day, 7 days a week.

Old Saybrook, CTUpdated 0 paid placements in any rankingHow we rank

Call (860) 376-4896Website ↗

Key facts

Key facts about D/E/F Services Group, LTD
Address40 Research Pkwy, Old Saybrook, CT 06475Get directions
Phone(860) 376-4896
Websitedefsg.com
HoursOpen 24 hours, 7 days a week
Google rating4.4 from 33 Google reviews

Trades

Each trade shows the evidence we matched it on.

Service area

Serves Old Saybrook and 11 towns within 25 miles: Madison, East Haddam, Waterford, Guilford, New London, Groton, Montville Center, Conning Towers-Nautilus Park, North Branford, Ledyard and Branford.

Based in Old Saybrook, CTView on map

Opening hours

Opening hours for D/E/F Services Group, LTD
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

D/E/F Services Group, LTD compared with nearby businesses
BusinessRankCR ScoreGoogle ratingLicense verifiedSaturdaySundayDistance away
D/E/F Services Group, LTD (this business)—604.4 (33)—YesYes
Air, Inc.#3614.8 (692)—YesYes23.4 mi
Connecticut HVAC Services llc#4604.6 (107)—YesYes9.4 mi
DTS Oil & Gas Service & Solutions LLC#6595.0 (150)—YesYes23.2 mi

See all 192 ranked HVAC contractors in Old Saybrook

Reviews

ContractorsRanked reviews

No ContractorsRanked reviews yet

Google

4.4from 33 Google reviews

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Questions about D/E/F Services Group, LTD

How is D/E/F Services Group, LTD ranked in Old Saybrook?

D/E/F Services Group, LTD is ranked #5 of 192 HVAC contractors in Old Saybrook 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 D/E/F Services Group, LTD’s hours?

D/E/F Services Group, LTD 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 D/E/F Services Group, LTD serve?

Serves Old Saybrook and 11 towns within 25 miles: Madison, East Haddam, Waterford, Guilford, New London, Groton, Montville Center, Conning Towers-Nautilus Park, North Branford, Ledyard and Branford. 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 D/E/F Services Group, LTD?

D/E/F Services Group, LTD has a rating of 4.4 from 33 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 D/E/F Services Group, LTD?

Call D/E/F Services Group, LTD on (860) 376-4896. The business is at 40 Research Pkwy, Old Saybrook, CT 06475. Its website is linked in the key facts on this page. Ask for a written estimate before any work starts.

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