Compare the same service
Separate an equipment shop, installer, care service and intermediary. Ask who contracts with you and who supplies the work. Compare fit, service area, full CAD cost, exclusions, maintenance and cancellation. A lower advertised price may cover a different scope.
Evidence before ranking
We do not describe a provider as tested without a documented test. Public information and provider statements are distinguished from hands-on experience. Commercial remuneration does not determine editorial conclusions. A directory or a reference in a guide is not a personal recommendation.