# Request evidence of a quality installation

Lesson 2 of [Compare HVAC repair and installation proposals](https://hvacpros.fyi/academy/buy-hvac-repair-and-installation.md), 10 minutes.

A new HVAC unit is part of an installed system. ENERGY STAR's quality-installation guidance asks buyers to consider four areas: appropriate design and sizing, airflow, refrigerant charge and the home's ducts. These are useful topics for a handover conversation. They do not turn a buyer into an insta…

The rest of this lesson is for learners enrolled in the course. [See how Compare HVAC repair and installation proposals works](https://hvacpros.fyi/academy/buy-hvac-repair-and-installation.md).

Also on the [web page](https://hvacpros.fyi/academy/buy-hvac-repair-and-installation/installation-evidence).