2023 Efficiency Changes for HVAC Systems Keep up to date with what the 2023 HVAC efficiency changes mean and how they impact claims. Related Content:HVAC System Energy Efficiency Standards Guide5 Things To Know About 5 Complex HVAC Systems GuideLess Common Commercial HVAC Systems Adjusters Should Be Familiar WithWhy Some HVAC Systems and Water Heaters Use Flue Pipes and Chimney Liners