Your car came with an owner’s manual. So did your dishwasher, your refrigerator, and even your electric toothbrush. But the most expensive, most resource-intensive thing you own—your home—almost certainly did not. And that gap between what you could be doing and what you are doing is silently costing you money, wasting energy, and harming our environment unnecessarily.

Your Home Deserves a Manual illustration

Think about what you actually know about your house’s systems. When was the last time you changed your HVAC filter? What temperature is your water heater set to? Which direction should your ceiling fans spin right now? Where is the shutoff valve for your outdoor hose bibs? If you had to pause on even one of those, you’re not alone.

A survey by The Zebra found that 29 percent of Americans never change their home air filter, and 82 percent don’t change it monthly as recommended during heavy-use seasons. That single act of neglect can increase your heating and cooling energy consumption by up to 15 percent, according to the U.S. Department of Energy. For the average household, heating and cooling already account for roughly 45 percent of total home energy use. A clogged filter doesn’t just waste electricity or fuel—it shortens your HVAC system’s lifespan.

The fix is better documentation so you know what to do (or hire to have done for you) to keep your home operating at peak performance. This week, your one step toward sustainability is to start writing a sustainable homeowner’s manual—a personalized operating guide for your house or apartment. Once you’ve collected and organized this information, you can add notes and calendar reminders on your smartphone for easy access.

What Goes in a Homeowner’s Manual

This isn’t a binder of appliance warranties stuffed in a drawer (though it is a good idea to keep those warranties and owner’s guides). A homeowner’s manual is a living document that captures how your home works and how to run it well. The concept comes from the world of professional energy auditing. In Maine, energy auditor All Around Home Performance creates custom owner’s manuals for its clients, inventorying every mechanical system in a house and its recommended maintenance schedule. It’s the kind of resource most of us wish we’d been handed on move-in day.

You don’t need a professional to make one. Grab a smartphone, a paper notebook, a binder, or open a document on your computer, and begin with these core sections. Over time, you can organize and store all this information on a smartphone for easy access, using the built-in notes and calendar apps you probably already have installed.

Your systems inventory. Walk through your home and list every major system and appliance: heating system, air conditioner or heat pump, water heater, refrigerator, washer, dryer, dishwasher, and any ventilation equipment. For each one, write down the manufacturer, model number, installation date (if you know it or can estimate), and where you keep the manual. If you’ve lost the paper manual, almost every manufacturer publishes digital versions online—a quick search of the brand and model number will usually turn one up.

Your maintenance calendar. This is the heart of the manual. For each system, note what maintenance it needs and how often. Your HVAC filter should be checked monthly during heavy-use seasons (winter and summer) and replaced according to the manufacturer’s recommendation. Your refrigerator’s condenser coils should be vacuumed once or twice a year. Your water heater should be flushed annually to remove sediment. Your clothes dryer vent (unless you have a ventless dryer) should be cleaned at least once a year to prevent lint buildup and fire risk. Write the dates down, and then set calendar reminders so you actually follow through.

Your optimal settings. Real energy savings are possible if you choose settings that balance comfort with efficiency: your thermostat’s seasonal schedule, your water heater temperature (120°F is the sweet spot recommended by the Department of Energy—many homes are set higher, wasting energy and risking scalds), your refrigerator and freezer temperatures (37°F and 0°F respectively), and your ceiling fan directions by season. Writing these down means you won’t second-guess yourself, and anyone else in the household—or a house-sitter—can keep things running efficiently in your absence.

Your home’s quirks. Every home has them. Maybe the upstairs bedroom overheats because of a south-facing window. Maybe the basement stays damp unless you run a dehumidifier from April through October. Maybe one bathroom fan is louder than the others because its duct run is longer. Recording these observations alongside your solutions turns trial-and-error knowledge into a transferable resource. If you ever sell your home, this section alone could save the next owner thousands of dollars in avoided energy costs.

Why This Matters

This step sits along the Habitat pathway—the practices that make our buildings healthier, more durable, and more in harmony with the natural world around them. Documenting your home’s insulation levels, window types, and weatherization history creates a baseline for future improvements. When you’re ready to take bigger steps—sealing air leaks, adding insulation, or upgrading to a heat pump—you’ll already know where you stand.

One Step This Week

Find a cozy spot this weekend—by the fire, at the kitchen table, wherever you think best on a late-winter day—and start your manual. You don’t need to finish it in one sitting. Begin with whatever you can do right now. Here are some ideas:

  • Walk to your furnace or heat pump and write down the manufacturer, model, and the date on your current filter. Check whether the filter looks dirty. If you can’t see light through it when you hold it up, replace it. Note the filter size so you can easily buy replacements.

  • Find your water heater and check the temperature dial. If it’s set above 120°F, turn it down. Write the new setting in your manual.

  • Open your phone’s calendar and set a recurring monthly reminder to check your HVAC filter, and quarterly reminders for other seasonal tasks like reversing ceiling fans or cleaning refrigerator coils.

That’s enough for today. Over the coming weeks, add to your notes whenever you interact with a system in your home. Changing a light bulb? Note the type and wattage. Calling a repair technician? Record what they did and what they recommended. Each small entry builds an operating manual that will save you energy, money, and frustration for years to come.

Your Home, Your Guide

A homeowner’s manual won’t save our planet by itself. But it transforms your relationship with the place where you spend quality time. Instead of reacting to breakdowns and guessing at settings, you’ll be operating your home with intention—and that’s exactly what the journey toward sustainability looks like, one informed decision at a time.

You’ll note that operating your home more sustainably saves energy. For more on sustainable energy practices—from optimizing efficiency to electrifying your home and generating solar power—explore the Energy pathway in the Sustainable Practices Handbook or visit www.suspra.com. And for a professional take on the homeowner’s manual concept, check out the work of All Around Home Performance at allaroundhp.com/home-owners-manuals.

References and Resources

This article explores a step on the Habitat pathway—one of seven pathways to sustainability in the Sustainable Practice framework. For more guidance, visit www.suspra.com.