What are the disadvantages of heat pumps?

Heat pumps provide both heating and cooling, and they work very well for both, if designed and installed properly. However, a new heat pump does cost more than replacing a furnace. If your home has a natural gas furnace or boiler and is comfortable in the summer without air conditioning, then a heat pump may not make economic sense for you. On the other hand, heat pumps only cost slightly more than a central air-conditioning (AC) system. So, if you want to add AC to your home or need to replace your existing AC, choosing a heat pump makes a lot of sense, especially with utility rebates and federal tax credits. The heat pump will keep your home cool in the summer, while also helping to heat your home in the winter, with the same or lower heating costs and much lower carbon emissions.