2009 IECC Section 302.1: Interior Design Conditions
- The interior design temperatures used for heating and cooling load calculations shall be a maximum of 72° (22°C) for heating and a minimum of 75°F (24°C) for cooling.
|ASHRAE Comfort Zone|
So, customer education to establish expectations is a must in today's equipment sales process. If you install a system to code, the very minimum required by state laws, it will not run the same as the old unit. We found it is much more efficient to properly size systems for homes, not homeowner lifestyles. Sure, you can give the customer what they want - but I am sure they would rather be comfortable, with a unit installed to code!