If you have had a couple or more service calls in the past years, it is a warning sign. Older furnaces are more prone to breakdowns. The little fixes may grow to bigger ones, and you may find that you ...

Traditionally, preventive maintenance (PM) is structured for X tasks to be performed at Y intervals. Cleaning and calibrating are common PM activities. Calibrating involves taking a measurement; If it ...

Investopedia contributors come from a range of backgrounds, and over 25 years there have been thousands of expert writers and editors who have contributed. Michael Boyle is an experienced financial ...