Sizing — heating + cooling: code vs good practice

Code: Manual J + S. Good practice: meet code.

Ductwork — heating + cooling: code vs good practice

Code: Manual D (or approved method). Good practice: meet code.

Code: no specific requirement. Good practice: 95%+ AFUE.

Code: no specific requirement. Good practice: MERV 8–13.

Code: mechanical ventilation. Good practice: meet code.

Code: CO alarms. Good practice: meet code.

Systems · Chapter 25

Code: mechanical ventilation. Good practice: meet code.

Code: CO alarms. Good practice: meet code.

Heating and cooling move heat in or out and keep air fresh and dry. Sizing it right matters more than the brand.

IRC M1401.3 Manual J + SIRC R303.4 ventilationIRC G24 combustionSEER2 · HSPF2 · AFUE

25.1

Every system makes or moves heat, delivers it by air or water and is controlled by a thermostat.

Size by calculation, not by rule of thumb.

The rest of Heating + cooling: 4 more spreads, 15 drawings and 9 code citations, plus every other chapter, is part of the full fieldbook.

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