Guest, Customer
Under your roof in winter there are more mouths to feed because you let guests stay with you when it's cold. Some of them aren't family, so they have to pay to stay under your roof and get food. Those are customers.
Picture all of the hungry guests and customers under your roof, eating your food and sleeping on your floor.
きゃく
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One of your guests is a regular named Kyaku (きゃく) the customer. Kyaku is always staying over at one place or another, so everyone knows their name.
Kyaku looks just like any other customer. Picture a stereotypical "customer" type person in your head.