Set the alarm clock for 3:36 am

How to use the online alarm clock

Preparing to check the heating in an old stone house, you can set this 3:36 am alarm before settling down for the night. It gives you a clear cue to inspect the boiler, radiators or thermostat while there are still 24 minutes before 4:00 am, leaving time to notice how the rooms are warming rather than rushing through the check.

Because the heating check is planned for the middle of the night, leave this page running where the browser can keep it active. Moving it behind another page is generally fine, although some browsers may reduce background activity to conserve power, so confirm that sound is allowed and keep the computer awake. If the browser stops running before 3:36 am, the heating check will not receive an audible alarm; a separate alarm clock is a sensible backup when missing the time would matter.

An old stone house can feel cool overnight even after a warm day, while a hot spell may leave upstairs rooms stuffy at this hour. Before resting, set the air conditioning or fan to a steady, moderate setting and keep the heating controls separate from it. At 3:36 am, compare the actual room temperature with the thermostat reading before changing either system, as thick walls can make one room respond more slowly than another.