42 Customized engineering services, namely, custom manufacturing of air handling equipment, motors, fans, heat exchangers, and controls for large commercial and industrial applicators; providing temporary use of non-downloadable computer software in the field of customized engineering services, namely, custom manufacturing of air handling equipment, motors, fans, heat exchangers, and controls for large commercial and industrial applicators; providing temporary use of non-downloadable software for connecting, operating, and managing networked HVAC systems to the internet of things; monitoring HVAC systems to ensure proper functioning