Hosack Plumbing, Heating & CoolingHVAC contractor in O'Fallon, MO

Hosack Plumbing, Heating & Cooling is ranked #4 of 293 HVAC contractors in O'Fallon by CR Score, with 65 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.

Hosack Plumbing, Heating & Cooling 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.

Serves O'Fallon and 11 towns within 25 miles: Dardenne Prairie, Saint Peters, Lake Saint Louis, Weldon Spring, Wentzville, Saint Charles, Chesterfield, Wildwood, Bridgeton, Maryland Heights and Ellisville. 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.

Hosack Plumbing, Heating & Cooling has a rating of 5.0 from 696 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.

Call Hosack Plumbing, Heating & Cooling on (636) 696-3384. The business is at 110 W Pitman St, O'Fallon, MO 63366. Its website is linked in the key facts on this page. Ask for a written estimate before any work starts.