Replacing HVAC filters.

Seasonal HVAC tune-ups (springtime for A/C and fall time for heat)

Cleaning outdoor condenser and clearing obstructions/debris.

Inspecting system for proper function, air flow, and drainage.

Clean air return grilles and vents.

Swamp cooler maintenance and repair.

Thermostat replacement or upgrade.

Troubleshoot non-working or under-performing system.