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Heating & cooling DIY guides.
Safe checks and first responses for common situations. Read the limits of each guide before starting.
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Choose a situation
Each guide explains who it is for, the supplies needed, when to stop and what to do next.
Hands-on check · About 10–15 minutes
Open guide Your A/C runs but is not cooling well
Check user-accessible settings, filter and outdoor airflow before booking a diagnosis.
Hands-on check · About 10 minutes
Open guide The heat is not coming on
Check safe, user-facing settings while treating gas or carbon monoxide warnings as an emergency.
Need a technician? See heating & cooling service or request a time.