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You may absolutely post the names of the products you install on your website. There is nothing illegal about doing so.
You can use their actual names. You can say "I service and install Pella Windows, especially those purchased from Home Depot. I also fix Maytag appliances and Sears/Kenmore washers."
I this case, you are using the names in the nominative sense (naming them). That is what their names are XXXXX XXXXX to identify them - so you can use them too.
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