Energy & Comfort

Heating and cooling account for a large share of a home's energy use, and most of what keeps that system running well is routine, low-risk maintenance rather than technical expertise -- knowing what to check, how often to check it, and what your specific equipment actually needs.

The guides here focus on the maintenance homeowners can safely handle themselves, using manufacturer guidance and official sources like ENERGY STAR and EPA as the baseline, while being clear about where routine maintenance ends and system-level HVAC work begins.

How we think about energy and comfort maintenance

Every guide in this section follows the same approach:

Baseline -- start from the manufacturer's guidance for your specific equipment rather than a generic rule of thumb.
Check -- build a regular inspection habit so you catch a change before it becomes a bigger problem.
Adjust -- know when your real conditions call for a shorter interval or closer attention than the baseline assumes.
Escalate -- recognize when a comfort or airflow problem has moved past routine maintenance and needs an HVAC professional.

Guides

Illustration of an accessible residential HVAC filter in its normal maintenance location.

How Often Should You Change Your HVAC Filter? A Homeowner's Decision Guide

Check your HVAC filter monthly, replace it every 60 to 90 days per manufacturer guidance, and swap it sooner if it looks dirty or conditions like heavy use or wildfire smoke make it load faster.

Illustration of a window and exterior door being checked for air leaks.

How to Find Air Leaks Around Windows and Doors Before You Seal Them

Find the leak before choosing the fix: use a visual inspection, the paper test on moving joints, and a daylight check to confirm whether the draft is a real air leak or just a cold-surface sensation, then match weatherstripping or caulk to the joint you actually found.

Illustration of a homeowner measuring attic insulation depth near the floor joists.

How Much Attic Insulation Do You Need? How to Check Before You Add More

Look across the attic floor -- if insulation is level with or below the floor joists, you likely need more; measure depth in several safe spots, estimate R-value at roughly R-3 to R-3.5 per inch depending on material, and compare that estimate against current climate-zone guidance before adding anything, addressing air leaks, moisture, or unsafe wiring first.

Illustration of a home energy assessor using a blower door and infrared camera to evaluate a house's envelope.

When Should You Get a Home Energy Audit? What It Can Tell You Before You Upgrade

Consider a professional home energy audit when comfort or efficiency problems are spread across the house, the cause isn't obvious, or you're about to spend real money on windows, insulation, or HVAC equipment; a calibrated blower door measures how leaky the envelope actually is and infrared imaging can point toward likely trouble spots, but neither replaces professional interpretation, and safety or moisture findings should always be addressed before efficiency upgrades.

Illustration of a homeowner checking a supply register and comparing airflow between rooms.

Why Is One Room Hotter or Colder Than the Rest? What to Check Before Calling HVAC

Before assuming the HVAC equipment is failing, check whether the room's supply register is open and unobstructed, compare its airflow to similar rooms, note whether the problem changes with the door open or closed, rule out a dirty filter, and consider sun exposure and insulation; call an HVAC professional when airflow is clearly restricted, ducts are hidden or damaged, or several rooms are affected.