What is that smell coming from my new heat pump?

More than likely what you smell is the backup emergency heat or electric heating elements in your comfort system. The backup heat will activate when it’s very cold out, or a large temperature increase (larger than 2°F or 1°C) has been requested. It can also activate when heat is detracted from the home – opening doors or windows, outside gusts of wind, etc.

After cooling season aux heating elements that have been unused for an entire season have been coated with dust, once auxiliary heat is initiated this dust burns off and has a temporary but distinct odor.