As homes become more and more tightly sealed in the quest for better energy efficiency, there is also a growing need for better ventilation systems. Older homes allow more outside air to circulate through the house, increasing the load on the HVAC system but keeping air relatively "fresh" (of course, this depends entirely on the outside air quality); in contrast, newer homes have vastly improved their energy efficiency by sealing exterior air leaks at the cost of recirculating "stale" air. Luckily, there are already good solutions available to homeowners to help solve these ventilation issues. With COVID-19 air circulation has become a very important piece when it comes to controlling how we return to what we used to know as "normal".