Dependable AC Installation and Repair Service in Evansville & Louisville
Your home is the place that you should feel the most comfortable in, but when your air conditioning stops working, it can quickly lead to an uncomfortable environment. You might also be stuck with rising cooling bills even if your household usage hasn’t changed. When that happens, it’s time to call in the experts at A+ Derr, who can help with any cooling system issues that you might be having.
Having problems with your air conditioning? Contact us online to schedule service in Evansville or Louisville.

Why Timely AC Service Matters in Evansville & Louisville
Summers in Evansville, IN, and Louisville, KY, can push your cooling system to its limits. When temperatures climb, you want an air conditioner that’s dependable and efficient, ready to handle the heat without driving up energy costs. A+ Derr has been part of the Kentuckiana community for decades, helping homeowners keep their systems in top shape so they can stay comfortable through the hottest months.
One of the best ways to avoid disruptions is to schedule regular system checkups before peak cooling season. A tune-up can help your AC run more smoothly, use less energy, and reduce the risk of unexpected problems. If something does go wrong, A+ Derr’s experienced technicians are available day or night to get your home cool again as quickly as possible. With a reputation built on local service and quality workmanship, they’re a trusted choice for keeping your home comfortable all summer long.
AC Installation, Repair & Maintenance Services
Whether you need help with installing an entirely new air conditioner, repairing the one you currently have, or simply having a routine maintenance check scheduled, our team is ready and able to help.
How To Tell If Your AC Unit Needs To Be Repaired Or Replaced
The best way to tell if your air conditioning needs to be repaired or replaced is to have one of our skilled professionals take a look, but there are some signs you can be on the lookout for at home, such as:
- Your air conditioning is blowing out warm air
- The thermostat is not working
- Strange noises are coming from the AC unit
- Odd smells are coming from the AC unit
Energy-Efficient Options from A+ Derr
Utility costs are on the rise, and if you’re like most Louisville and Evansville homeowners, you’re looking for ways to keep your home comfortable as affordably as possible. We’re your partners in energy-efficient HVAC equipment. From smart upgrades like a programmable thermostat to new equipment like heat pumps and ductless mini-splits, we have the tools and expertise to help you manage your home’s energy use.
Not sure where to start? We’ve got you covered. We can recommend a system that meets your household’s climate control needs, taking into account your home’s size and layout. Proper installation is crucial to performance and energy efficiency, and with our award-winning services, you know your home is in good hands.
A+ Derr Is A Lennox Premier Dealer

At A+ Derr, we believe in providing you with the best air conditioning products in the market. That’s why we are proud to be a Lennox Premier Dealer! As a Premier Dealer, we have access to top-of-the-line AC products so that you can benefit from their enhanced cooling power. Lennox systems are energy-efficient, powerful, and reliable.
24/7 Repair Service Available
At A+ Derr Heating & Cooling, we provide comprehensive air conditioning services tailored to local homes, including installation, repair, and routine maintenance for central air systems, heat pumps, and ductless units. Our team is equipped to handle Midwest weather challenges, helping ensure consistent cooling, improved energy efficiency, and dependable comfort all summer long.
We know that your air conditioning doesn’t always break down during convenient business hours, so we offer 24/7 repair services. Whenever your AC breaks, one of our team members will be here to take your call!
Benefits Of System Maintenance
Having a yearly system maintenance check performed on your air conditioning system helps to identify problems with your system that could become larger issues later. This will protect you against a broken AC and will also save you money on costly repairs later on down the line.
Frequently Asked AC Questions
When should I replace my air conditioning unit?
If your unit is older than 10 years, it is a good time to start at least considering purchasing a new air conditioning unit. Even well-maintained older units begin to lose efficiency over time, and upgrading to a modern system means getting the latest in energy savings and comfort technology.
What is SEER or SEER2?
SEER stands for Seasonal Energy Efficiency Rating, it’s the calculation of your unit’s energy efficiency. Newer units are measured by stricter standards and given a SEER2 rating. The higher the SEER2 number on your unit, the more efficient the unit is. Mini-splits may have a SEER2 rating of 20 or more, while heat pumps on average are rated at around 16-18. High-efficiency AC units may be rated at 17-22.
How much money will a new HVAC or AC system cost?
The cost of a new HVAC or air conditioning system depends on your home and comfort needs. To get you the most accurate cost, please schedule an appointment with one of our comfort advisers. All estimates are free of charge and will ensure you are getting a precise and accurate price. Furthermore, with our 0% financing, we have actually seen AC and HVAC systems pay for themselves.
What size HVAC equipment do I need?
To calculate the appropriate HVAC system size, we would need to schedule one of our comfort advisers to visit your home. Square footage, windows, insulation, and ceiling height are just a few of the relevant items that will determine the type of AC system you need.
Should I get a new AC, heat pump, or ductless mini-splits?
It depends. We can help you decide based on your specific needs, household size, and budget. Heat pumps and ductless mini-splits provide energy-efficient heating and cooling, making either a good choice for year-round comfort. New air conditioners typically offer a lower upfront cost and can also offer energy savings if you’re upgrading from an older unit.