The answer to 'when to replace heat pump' is that most heat pumps need to be replaced every 10-15 years, or when they become less efficient and more costly to operate. Heat pumps have a limited lifespan and as they age, their components wear out and they lose efficiency, resulting in higher energy bills and more frequent repairs.
Some key signs it may be time to replace your heat pump include: it's over 10 years old, it requires frequent repairs, your energy bills have significantly increased, or it's no longer keeping your home comfortable. An HVAC professional can evaluate your system and recommend whether a replacement is needed.