2-in-1 HVAC Field Reference Pack — Thermostat Wiring & Preventive Maintenance

The 2-in-1 HVAC Field Reference Pack brings together two practical resources designed for HVAC technicians, installers, apprentices and students who want to keep essential field information organized and easy to access.

Inside this complete pack, you'll receive:

1. Thermostat & Low-Voltage Wiring Quick Guide

A practical reference for common thermostat terminals, low-voltage control wiring, C-wire basics, conventional systems, heat pumps, multi-stage equipment, smart thermostats and thermostat replacement workflows.

2. Preventive Maintenance & Tune-Up Pack

A complete collection of ready-to-use maintenance checklists for residential A/C systems, heat pumps, mini-splits, packaged units and commercial refrigeration, including filters, coils, condensate systems, outdoor units, maintenance records and customer handoff sheets.

With this 2-in-1 pack, you can keep both control-wiring references and preventive maintenance checklists in one place for faster consultation during everyday HVAC/R work.

Instead of purchasing both guides separately, add the complete pack to your order and get both practical field references together.