Best Auxiliary Heater & AC Control Relays of 2025

The ACDelco Relay is a professional aftermarket replacement known for its premium quality. It ensures the performance and dependability expected from ACDelco products. This relay is meticulously manufactured to meet precise standards for fit, form, and function. By choosing the ACDelco Relay, you can trust in its reliability and durability, providing peace of mind for your vehicle's auxiliary heater and air conditioning control needs.

The Dorman 904-356 Intake Heater Relay is a direct replacement for the original engine air intake heater relay on select Dodge models. This relay is an ideal solution for a damaged or failed original part and is made from quality components for reliable performance and a long service life. To ensure proper fit, input your vehicle's make, model, and trim level into the garage tool. Backed by a team of product experts with over 100 years of automotive experience, you can trust the quality of this durable construction relay.

The Dorman 904-300 Intake Heater Relay is a durable and trustworthy replacement part that is designed to match the fit and function of the original relay for select Dodge/Ram models. This relay is made from quality components to ensure reliable performance and a long service life, making it the ideal solution for damaged or failed original parts due to fatigue. To ensure the perfect fit, input your vehicle's make, model, and trim level into the garage tool.

The folosem Thermostat Circuit Board is designed to replace your existing circuit board, ensuring compatibility with various Dometic RV air conditioner models. If you experience issues like an uncontrollable fan or a compressor that won’t shut off, upgrading to this circuit board can resolve these problems effectively. Made from high-quality materials, it offers excellent resistance to moisture and corrosion, enhancing its durability. Additionally, you can choose between green and white colors based on your preference, allowing for a personalized touch to your RV setup.

The MOTOALL Air Intake Heater is designed specifically for 1994-2002 Dodge Ram 2500 and 3500 models with diesel engines. It serves as a reliable replacement for several Chrysler and Cummins part numbers, ensuring compatibility and ease of installation. This heater improves engine performance by facilitating quicker starts in cold weather, allowing you to get on the road faster. Additionally, it enhances the overall efficiency of your vehicle's heating system, providing a more comfortable driving experience during chilly months. With this product, you can trust that your engine will operate optimally in varying temperatures.

PartCatalog Relay PC-196525 is a high-quality OE replacement designed for your vehicle. With this relay, you get a direct fit, hassle-free installation. Experience exceptional quality and performance that matches your original parts. Ensure perfect compatibility by checking the product specifications. This relay is essential for maintaining your vehicle's heating system.

The Packard Heat Sequencer Relay is designed to handle up to 25 Amps at both 120 and 240 Volts, ensuring reliable performance in your heating and cooling systems. Its full-load rated auxiliary contacts enhance the relay's functionality, allowing you to control additional components efficiently. Built to resist shock and vibration, this solid-state device ensures durability and longevity, making it a smart investment for your HVAC needs. The quick-connect terminals simplify installation, saving you time and effort while ensuring a secure connection.

The DVPARTS Heater Relay is designed specifically for the Dodge RAM 2500 Pickup models from 2007 to 2010. With its reliable part number 904-300 5187880AC 56029173AB RY-1779, you can ensure a perfect fit for your vehicle. This product comes with a 12-month warranty, giving you peace of mind with your purchase. Its high-quality construction ensures efficient performance, helping to maintain optimal heating and air conditioning control. By choosing this relay, you enhance your vehicle's functionality and enjoy a smoother driving experience.

The Dorman 904-308 Intake Heater Relay is a direct replacement for the original part on specified Dodge models. The relay is made from quality components to ensure reliable performance and long service life. It is the ideal solution for a damaged or failed original part. To ensure fit, users can input their make, model, and trim level into the garage tool. Backed by a team of product experts in the United States and over a century of automotive experience, this relay is trustworthy and reliable.

The Jerwickeli Relay 12VDC is a dependable component designed specifically for water heaters and air conditioners. With a voltage rating of 12VDC and a 15A current capacity, it efficiently manages moderate electrical loads, ensuring optimal performance in your systems. The 4-pin configuration makes installation straightforward, allowing you to connect it easily whether you are a professional or a DIY enthusiast. Built to endure the tough conditions often found in heating and cooling systems, this relay promises long-lasting reliability, giving you peace of mind in your home or business applications.