More accurate sizing: fixed a calculation that could oversize equipment, especially in mild climates — results may be lower, closer to a true Manual J. Re-run saved projects to update.
• Floor insulation now affects homes over an unconditioned basement.
• Better climate data for more ZIP codes.
• Humidity check is now climate-aware.
• Cold-climate heat pumps: realistic balance point + backup heat.
• New design temps, equipment range & "How We Calculate" in Settings.