Keep the units visible.
Retain the unit notation with each proposed U-factor.
Windows · Tracyton, Washington
Window replacement in Tracyton can involve product sheets using different U-factor units. Ask the supplier to place the figures in the same unit system before ranking two proposed windows.
A number without its units can make equivalent thermal information look very different. Keep the exact window configuration and rating basis with the comparison.

Window replacement
When two sheets report different U-factors, ask the supplier whether each uses US or metric units and request a consistent comparison. Retain the original rating documents and identify which complete window configuration each describes. Have the provider check applicable performance requirements separately. Do not decide that an imported or domestic unit insulates better simply because its brochure shows the smaller unqualified number.
Retain the unit notation with each proposed U-factor.
Have the supplier present equivalent values using the same rating and unit basis.
Match the compared information to the actual window being priced.
Before work begins
Use the parcel’s County process to describe the units and any opening changes. A converted brochure value alone does not establish the complete documentation or construction requirements.
Ask the supplier to reconcile unfamiliar ratings before ordering, preserving the original documents and any applicable certified product record.
Ask the supplier to reconcile the unit systems and rating basis first.
It changes the numerical expression; assess the actual product and its performance information.
Have the provider confirm the actual configuration and applicable project requirements.
Share the actual window configurations and rating documents so the supplier can explain a consistent comparison.