Exceptional climate control does more than keep you comfortable in extreme weather. It also reduces household humidity, minimizes mold, and improves air quality. That’s why A+ Derr is more than just an HVAC company. We strive to improve your quality of life in three core areas: comfort, budget, and energy efficiency. We repair all makes and models of HVAC systems, whether you need to dial down the heat in summer or up in winter. We offer 24/7 emergency repairs and a wallet-friendly maintenance plan to make life a little easier. We install some of the industry’s finest systems as a Lennox Premier Dealer.Take control of your comfort by calling A+ Derr’s Mount Carmel team at (877) 914-1764 or schedule service online.
Expert Heating
We work with a wide range of HVAC brands and models. Our expertise extends to heat pumps, furnaces, ductless mini-splits, and more, so we can help you track down the perfect option for your pocket. Our services include:
- Heating repair: We’ll diagnose your symptoms correctly and ensure your repair lasts.
- Heating installation and replacements: HVAC systems have a life span of 10 to 25 years. If your system has reached the end of its life and requires frequent repairs, we offer a 100% satisfaction guarantee for the year after your installation.
- Heating maintenance: Your system can only perform optimally if serviced at least once a year. Our maintenance plan makes annual services easier to budget for and schedule.
Arrange a heating service with A+ Derr in Mount Carmel by calling us at (877) 914-1764.
Dependable Cooling
We have decades of experience behind us, so we’ve dealt with every air conditioning problem imaginable. We use the latest best practices and high-quality components. We offer:Â
- AC repair: If your AC is leaking, buzzing, or displaying other worrying symptoms, we’ll execute a flawless repair. If your system breaks down during an unforgiving heat wave, our 24/7 emergency team will take care of it promptly.
- AC installation and replacement: We’re a Lennox Premier Dealer, so we can bring you industry-leading equipment and install it precisely as the manufacturer intended.
- AC maintenance: An annual service will keep your system’s energy efficiency in top shape and extend its life span.
Indoor Air Quality Solutions
You spend most of your life indoors. Air quality can have a dramatic impact on your health. We maintain, repair, and replace humidifiers, dehumidifiers, and air purifiers. We also offer a fastidious duct cleaning service to keep your air allergen-free and your HVAC system functional.Take your indoor air quality to new heights by contacting the Mount Carmel A+ Derr team at (877) 914-1764.
Why Choose A+ Derr?
A+ Derr has been a family-owned business for four generations, so we truly understand the importance of old-fashioned values. We strive to offer the finest solutions and products on the market. Our 100% satisfaction guarantee assures you of absolute security. We always offer prompt, trustworthy service and 24-hour emergency repairs. As an A+ BBB-accredited company with a five-star review average, we’ve proven our mettle, and that’s why our clients rate us so highly. Call A+ Derr’s Mount Carmel team at (877) 914-1764 for expert HVAC assistance, or schedule an appointment online.
FAQs
Is switching to a ductless air conditioner right for me?
If your architecture makes ducts impossible, a mini-split is the perfect option for full zone control. A mini-split can also improve your air quality if you suffer from allergies. You won’t experience accumulated dust and dander with no ductwork hidden from view.
Why won't my furnace turn on?
Dirty filters can reduce airflow, rendering your furnace useless, but your fuel source might also be responsible. You might have a faulty gas supply if your pilot light has gone out. Blower motors and ignition switches are equally common.
Recent Jobs and Reviews in Mount Carmel, IL
Mount Carmel, IL at a glance
A+ Derr Heating & Cooling has completed 2 jobs in Mount Carmel, IL on December 26, 2025.
A+ Derr Heating & Cooling has completed 22 jobs in Mount Carmel, IL in the last 12 months.
Job Locations and Reviews
Inspected existing HVAC system at customer's request via Justin. Evaluation revealed aging condenser unit mounted on concrete pad showing significant rust on fan grille, weathered housing with staining, and deteriorated insulation on refrigerant lines. Interior inspection included examination of air vent/return grille placement and condition. Recommended full system replacement due to age-related deterioration and potential efficiency issues.
Responded to service call for 20+ year-old heating system with no operation. Diagnosed failed thermostat (no display) and significant corrosion in exhaust flue. Visual inspection revealed damaged wiring connections and deteriorated internal components. Presented repair options and provided replacement system quote as requested by homeowner due to system age and extent of deterioration.
