For the HVAC industry, 2021 was a lot like 2020 — and that is not a bad thing. The COVID pandemic was still on everyone’s mind, but it did not slow down the HVAC industry. Contractors put their heads down and many had outstanding years as shipments of air conditioners and furnaces once again spiked. Supply chain issues remained a problem the industry is still attempting to sort out, while the upcoming refrigerant transition was much discussed.