In terms of energy efficiency for keeping a backup upright freezer, the basement is generally considered a better option than an attached garage. Here are a few reasons why:
Temperature stability: Basements tend to have more stable temperatures compared to attached garages. Basements are typically insulated and enclosed within the home's thermal envelope, which helps to regulate temperature fluctuations. This stability is beneficial for energy efficiency since the freezer doesn't need to work as hard to maintain the desired temperature.
Ambient temperature: Garages are exposed to external weather conditions, which can vary significantly throughout the year. Extreme heat or cold in the garage can impact the freezer's performance, causing it to work harder and consume more energy to maintain the desired temperature. Basements, on the other hand, tend to have a more moderate and controlled climate, providing a more favorable environment for energy efficiency.
Insulation: Basements often benefit from the insulation provided by the surrounding walls and the rest of the home. This insulation helps to retain the coolness or warmth within the basement, reducing the workload on the freezer's cooling system.
However, it's important to note that the specific circumstances of your basement and garage may vary. Factors such as insulation quality, ventilation, and exposure to sunlight can influence the energy efficiency of either location. It's recommended to evaluate the specific conditions of your basement and garage to determine the best option for keeping your backup freezer energy efficient.