About 21,000 Hydro-Québec customers will need to have their first-generation Hilo thermostats replaced as a preventative safety measure. “Following a technical assessment, Hydro-Québec concluded that these thermostats pose a very low risk of failure in certain exceptional situations, such as during a power surge,” the company stated in a news release. Hydro-Québec will replace those thermostats with second-generation Hilo thermostats. The government energy corporation said it will contact affected customers directly, and there is no cost associated with the replacement. Most of these thermostats were installed before Dec. 1, 2022. Other Hilo-brand thermostats are not affected. Customers who have not received an email or letter do not need to take any action. Additional information is available on the Hilo website.