Episode Details

Welcome to the audio version of the following web page: https://hvac.filterbuy.com/resources/air-conditioning-heat-pumps/what-does-em-heat-or-emer-heat-mean-on-thermostat-and-how-does-emergency-heat-work/ In this episode, we explain what “EM Heat” or “Emergency Heat” means on your thermostat and how it functions within a heat pump system. You’ll learn when emergency heat activates, how it differs from standard heat mode, and why it typically relies on electric resistance backup instead of the outdoor unit. We also discuss when to use EM Heat manually, how it impacts energy consumption, and why it is intended for short-term operation during extreme cold or system malfunctions. Because emergency heat places greater demand on your system, maintaining proper airflow becomes especially important to avoid efficiency loss and unnecessary strain. Using correctly sized filters such as 20x23x1, 16x20x1, 20x20x2, 20x25x6, 16x25x4, 9.75x23.75x2, 27x27x1, 23.5x30.75x2, and 22x26x2—available through retailers like Amazon, Walmart, eBay, Home Depot, and Target—helps support consistent airflow and balanced system performance. Selecting the appropriate MERV rating and replacing filters on schedule ensures your heat pump operates efficiently, even when emergency