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Althoff Home ServicesHVAC contractor in Crystal Lake, IL

Althoff Home Services is an HVAC contractor at 8001 S Illinois Rte 31, Crystal Lake, IL 60014, ranked #3 of 695 HVAC contractors in Crystal Lake and rated 4.8 from 1,043 Google reviews. Open 24 hours a day, 7 days a week.

Crystal Lake, ILUpdated 0 paid placements in any rankingHow we rank

Call (815) 455-7000Website ↗

Key facts

Key facts about Althoff Home Services
Address8001 S Illinois Rte 31, Crystal Lake, IL 60014Get directions
Phone(815) 455-7000
Websitealthoffind.com
HoursOpen 24 hours, 7 days a week
Google rating4.8 from 1,043 Google reviews

Trades

Each trade shows the evidence we matched it on.

  • HVACmain tradeGoogle main category
  • Plumbingadditional Google category
  • Electricaladditional Google category

Service area

Serves Crystal Lake and 11 towns within 25 miles: Cary, Lake in the Hills, Algonquin, Island Lake, Carpentersville, Huntley, West Dundee, Wauconda, McHenry, Barrington and Gilberts.

Based in Crystal Lake, ILView on map

Opening hours

Opening hours for Althoff Home Services
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

Althoff Home Services compared with nearby businesses
BusinessRankCR ScoreGoogle ratingLicense verifiedSaturdaySundayDistance away
Althoff Home Services (this business)—644.8 (1,043)—YesYes
Black Diamond Plumbing & Mechanical Inc.#1654.9 (6,580)—YesYes6.6 mi
24HR Home Comfort Services#2644.9 (1,374)—YesYes1.3 mi
Legacy Home Services#4644.9 (571)—YesYes1.8 mi

See all 695 ranked HVAC contractors in Crystal Lake

Reviews

ContractorsRanked reviews

No ContractorsRanked reviews yet

Google

4.8from 1,043 Google reviews

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Questions about Althoff Home Services

How is Althoff Home Services ranked in Crystal Lake?

Althoff Home Services is ranked #3 of 695 HVAC contractors in Crystal Lake by CR Score, with 64 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 Althoff Home Services’ hours?

Althoff Home Services 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 Althoff Home Services serve?

Serves Crystal Lake and 11 towns within 25 miles: Cary, Lake in the Hills, Algonquin, Island Lake, Carpentersville, Huntley, West Dundee, Wauconda, McHenry, Barrington and Gilberts. 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 Althoff Home Services?

Althoff Home Services has a rating of 4.8 from 1,043 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 Althoff Home Services?

Call Althoff Home Services on (815) 455-7000. The business is at 8001 S Illinois Rte 31, Crystal Lake, IL 60014. Its website is linked in the key facts on this page. Ask for a written estimate before any work starts.

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