Most of your visitors are already holding two other quotes
The page is not making a first impression, it is settling an argument the homeowner started last week.
Assume the visitor knows roughly what windows cost, has heard one long pitch, and is suspicious of everyone. Introductory copy about the importance of energy efficiency is wasted on them.
What they want is difference. Who does the installation, employees or subs. What happens to the trim and the interior when the old unit comes out. Whether the price they are quoted is the price they pay. Whether somebody answers when a sash sticks two winters later.
Put those answers on the page in plain sentences, above the fold on mobile if you can. A site that names its own trade-offs reads as credible next to three that claim to be the best.
Resist the temptation to hide behind a form. If the differences are only revealed after a homeowner surrenders their phone number, most of them will not.