Expert Air Conditioning Installation & Repair
Air Conditioning Repair & Installation in O'Fallon, IL
A Metro East summer is no time to be without air conditioning. When the heat and humidity climb, a reliable AC is what keeps your home livable — and when it fails, you want it fixed fast. Crumer’s provides air conditioning repair, seasonal maintenance, ductless mini-split systems, and new system installation for homeowners across O’Fallon, East St. Louis, Cahokia Heights, and the surrounding Metro East communities. We’re licensed, insured, and available 24 hours a day when the heat won’t wait.
Our Air Conditioning Services
Air Conditioning Repair
When your system blows warm air, trips the breaker, or simply won’t turn on, our technicians diagnose the problem and get you cool again — often the same day. Because breakdowns don’t wait for business hours, we offer 24-hour AC repair across the Metro East.
Common signs you need air conditioning repair:
• Warm air or reduced airflow coming from the vents
• The system short-cycles (turns on and off constantly)
• Strange noises, rattling, or grinding
• Water leaks or ice on the unit
• Higher energy costs despite no increase in usage
AC Tune-Ups & Seasonal Clean-and-Checks
The best AC repair is the one you never need. Our seasonal maintenance and system inspections help identify minor issues before they lead to costly repairs, improve efficiency, and extend the life of your equipment. Each service includes a new air filter to support proper airflow throughout the season. Schedule your tune up in spring before the hottest weather arrives.
Ductless Mini-Split Systems
Not every home has ductwork — and not every space is served well by a central system. Ductless mini-splits are an efficient way to cool (and heat) additions, converted garages, sunrooms, finished basements, and older homes without ducts. Crumer’s installs, repairs, and maintains ductless mini-split systems, giving you room-by-room comfort control and lower energy use. Because mini-splits provide heating as well as cooling, they’re a smart year-round comfort solution.
• Ductless mini-split installation
• Mini-split repair and maintenance
• Zoned, room-by-room comfort for additions, garages, and older homes
Air Conditioning Replacement & New Installation
When repairs start adding up or a system is simply past its prime, replacing it often costs less over time than nursing an old unit along. Crumer’s helps you choose a properly sized, energy-efficient air conditioner and installs it right — so you get consistent comfort and lower bills. Consider replacement if your system is 10–15+ years old, needs frequent repairs, or can’t keep up on the hottest days.
Air Filters & Indoor Air Quality
A clean air filter is one of the simplest keys to an efficient AC and healthier indoor air. A clogged filter forces your system to work harder, drives up your bills, and can lead to breakdowns. We replace filters as part of routine service and help you choose the right filter for your home.
• Air filter replacement
Why Choose Crumer's for Air Conditioning
• 20 years of HVAC experience
• Licensed and insured technicians
• 24-hour AC repair when you need it most
• 1-year labor warranty
• Low, honest rates — no hidden fees
AC Service Across the Metro East
We provide air conditioning service in O’Fallon, East St. Louis, Cahokia Heights, Belleville, Alton, Collinsville, Edwardsville, Granite City, and surrounding communities.
Air Conditioning FAQ
If your unit is under ~10 years old and the repair is minor, repair usually makes sense. For older systems with recurring problems or rising bills, replacement is often the better long-term value. We’ll give you an honest assessment either way.
A ductless mini-split delivers heating and cooling without ductwork — ideal for additions, garages, sunrooms, or older homes. It offers room-by-room control and strong efficiency. We’ll help you decide if it fits your space.
Most homeowners should replace it every one to three months to keep air moving efficiently. A clean filter keeps your AC efficient and your air healthier — we can handle it as part of routine service.
Yes — we’re available 24 hours a day. Call (618) 410-5321.
O’Fallon, East St. Louis, Cahokia Heights, Belleville, Alton, Collinsville, Edwardsville, Granite City, and surrounding communities.