Here’s the thing: We love portable generators ... to power. The average house will take at least 5,000 to 7,500 watts to run only the most critical equipment—think fridge, heat, and water.

Whole-house generators cost more than portables. They can range in price from $2,000 to $7,000. By comparison, large portable generators that power a whole house start at around $1,000.

Following last week's winter storm, many are investing in generators to help ensure key appliances are kept running when the power goes out. High winds and cold weather can cause intermittent and ...