# HVAC system installation

A replacement project should begin with the building and its comfort needs. Share the rooms served, any additions and the problems you want to solve. Choosing a unit only from the size of the old appliance can leave important design questions unanswered.

## During the assessment

Ask how capacity will be determined and how ducts, controls, electrical supply, ventilation and installation access fit the proposal. If fuel type changes, identify the related trades and utility work. The contractor should explain what is included and what still requires an on-site assessment.

## Compare the complete scope

Compare complete installed scopes: equipment, removal, distribution changes, controls, approvals, commissioning and warranty responsibilities. Ask how changes discovered during installation are handled. Incentives and financing should be confirmed directly against current program terms, not assumed from an old advertisement.

## Have these details ready

- Current equipment and the rooms it serves
- Renovation or addition plans
- Comfort complaints and desired improvements
- Space and access for removal and installation

## Can I choose the same size as the old system?

The old rating is useful background, but it is not a design assessment. Ask how the contractor accounts for the current building, rooms served and any alterations. A written proposal should explain the basis for the selected capacity and the related installation work.

## Further reading

- [CPSC: carbon monoxide safety](https://www.cpsc.gov/Safety-Education/Safety-Education-Centers/Carbon-Monoxide-Information-Center)
- [EPA: introduction to indoor air quality](https://www.epa.gov/indoor-air-quality-iaq/introduction-indoor-air-quality)