The time to invest in a new AC system for your home is now. Since this new mandate does not go into effect until the beginning of next year, the price for a new HVAC system is lower than it will be in 2025, if you can still find the more affordable systems in stock. Even an AC unit that is not 2025 compliant will still help your home be more environmentally friendly and bring a higher value to your home in 2025. Purchasing a 2025 compliant system is great too, since the energy savings of these super-efficient new systems will make your home more appealing to home buyers.