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Five everyday habits can make a home feel hotter in summer: leaving sun-facing window coverings open, using the oven when an outdoor option is safe, failing to run short-term exhaust after cooking or bathing, leaving ceiling fans on in empty rooms, and ignoring cooling controls or air leaks. Changing them can limit solar heat gain, indoor appliance heat, humidity and wasted cooling. None of the cited guidance proves that each habit raises every home’s temperature by a large, measured amount; results depend on climate, windows, insulation, occupancy and the cooling system.
Start with the no-cost changes: block direct sun, contain cooking heat, use bathroom and range exhaust briefly, operate fans only while people are present, and keep conditioned air inside. Then consider controls, air sealing, insulation or equipment improvements if the basics do not solve the problem.
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The five routines at a glance
| Routine | Heat or comfort mechanism | First adjustment | Cost and effort | Best-fit caveat |
|---|---|---|---|---|
| Open shades or drapes during direct sun | Solar radiation enters through glass | Close coverings before sun reaches the room | No purchase if coverings already exist; minutes per day | Most useful at sun-exposed windows; exterior shading can be stronger than interior fabric |
| Use the oven or other heat-producing appliances on hot days | Waste heat enters the conditioned space | Choose an outdoor grill when safe and practical, or a lower-heat cooking method | Usually no new cost; requires meal planning and safe equipment placement | An outdoor option must comply with local fire and building rules and never be used indoors |
| Skip exhaust while cooking or bathing | Heat and water vapor remain indoors | Run the range hood or bathroom fan, then switch it off within about 20 minutes unless rated for continuous operation | No purchase when fans work; a few minutes of attention | Exhaust must actually discharge outdoors; ventilation is less useful for cooling in hot, humid weather |
| Run ceiling fans in empty rooms | Electricity is consumed without helping an occupant; fans do not lower room air temperature | Turn the fan off when leaving and use it only where someone is present | No purchase; simple habit change | Fans improve perceived comfort, not the thermostat reading |
| Leave controls, doors, windows or leaks unmanaged | Conditioned air escapes or cooling operates when it is not needed | Check schedules and setpoints, close openings while air conditioning runs, then evaluate sealing and insulation | Settings are free; sealing or insulation ranges from DIY work to contractor work | Any thermostat or HVAC change must suit the equipment and local weather |
The table is a prioritization tool, not a ranking of the most common causes of overheating. Official guidance does not establish a prevalence order for these five routines.
1. Leaving shades or drapes open while summer sun enters
Windows can turn direct sunlight into a substantial indoor heat source. ENERGY STAR says a standard double-pane window allows approximately 75 percent of the sun’s heat into a home, citing Residential Windows by Carmody, Selkowitz, Arasteh and Heschong (2007). That figure is not a universal measurement for every window, orientation or house; glass type, coatings, frame, glazing count and exterior shade all change the result. The agency also explains that most ENERGY STAR certified windows reduce heat gain more than typical windows. See the ENERGY STAR residential windows guidance.
Change the timing, not just the fabric
- Identify windows that receive direct sun, especially east-facing glass in the morning and west-facing glass in the afternoon.
- Close blinds, shades or drapes before direct rays reach the room. Waiting until the room feels hot means solar energy has already entered.
- Keep coverings closed during the strongest sun, then open them when the window is shaded if you want daylight or a view.
- When replacing coverings, compare solar-shading performance, fit and ease of use rather than choosing by appearance alone.
ENERGY STAR’s low-cost guidance recommends closing shades and drapes in warm weather, and the Department of Energy (DOE) recommends window coverings that prevent solar heat gain. Those recommendations address sunlight through the glass; they do not promise a particular number of degrees of cooling from a specific curtain or blind. The two official references are ENERGY STAR low-cost tips and the DOE Energy Saver 101: Home Cooling infographic.
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Interior blinds and curtains are the simplest routine change because they require no installation. Exterior awnings, shutters or well-placed shade can stop more radiation before it passes through the glass, but they cost more and must be compatible with the building and local wind conditions. If only one room overheats, begin with its most sun-exposed window rather than replacing every covering.
2. Using heat-producing appliances indoors on the hottest days
An oven, cooktop, toaster oven and some countertop appliances release heat into the same indoor space your air conditioner is trying to cool. DOE’s cooling infographic advises not heating the home with appliances and suggests considering an outdoor grill instead of an oven on hot days. An outdoor grill can keep cooking heat outside, but it is an alternative only when safe and practical; never operate a fuel-burning grill indoors, in a garage or in another enclosed area.
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Choose a lower-heat cooking routine
- Move grilling outdoors when weather, local rules, fuel supply and safe clearance allow it.
- Use no-cook meals, a microwave or another appliance that adds less heat to the room when that fits the meal and the manufacturer’s instructions.
- Cook earlier in the day or prepare several portions at once, so the oven is not running during the hottest afternoon period.
- Keep lids on pots and use the smallest practical burner; this limits wasted heat without changing the recipe.
These changes avoid an indoor source of heat; grilling outdoors does not cool the house by itself. If an oven is necessary, combine its use with a properly operating range hood and keep the kitchen separated from the rest of the conditioned space when practical. Do not block required appliance clearances or ventilation to chase a temperature goal.
When an outdoor grill is not suitable
People in apartments, areas with fire restrictions or homes without a safe outdoor location may not have that option. A no-cook meal, advance preparation or a smaller appliance can still reduce the duration and intensity of indoor heat. The useful decision is whether a particular method adds avoidable heat indoors, not whether every household should buy another appliance.
3. Failing to exhaust heat and humidity after cooking or bathing
Cooking and bathing add both sensible heat and water vapor. Humid air can feel hotter because sweat evaporates less effectively, and moisture can condense on cool surfaces or encourage mold if the problem persists. DOE recommends using the bathroom fan during a shower or bath and the range hood while cooking to remove heat and humidity. Its cooling infographic covers the fan and hood advice.
Use exhaust for the event, then stop it
- Turn on the range hood before or as cooking begins. Use the bathroom fan when bathing starts.
- Confirm that the fan discharges outdoors rather than merely recirculating air through a filter. If you cannot verify the path, check the appliance or building documentation before assuming moisture is leaving.
- Let the fan run after cooking or bathing long enough to clear the plume, then turn it off within about 20 minutes unless it is specifically designed for continuous operation.
- Clean filters and grilles according to the manufacturer’s instructions so airflow is not restricted.
DOE’s Energy Saver guide (2022 PDF) advises turning off kitchen, bath and other exhaust fans within 20 minutes after cooking or bathing unless they are designed for continuous operation. Leaving a fan on indefinitely can remove conditioned air and increase energy use, so “more ventilation” is not automatically better.
Do not confuse exhaust with whole-house cooling
Ventilation can help remove a short-lived load from a kitchen or bathroom, but DOE cautions that ventilation is not an effective cooling strategy in hot, humid climates. Opening windows at night is sensible only when outdoor air is actually cooler and sufficiently dry, outdoor air quality is acceptable, and security allows it. In hot, humid weather, bringing outdoor air inside can add moisture and make the cooling system work harder. DOE’s broader Home Cooling guidance presents shading, insulation, efficient windows and doors, and suitable ventilation as a combination that can keep homes cool with low energy use in all but the hottest climates.
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4. Running ceiling fans in empty rooms or expecting them to cool the room
A ceiling fan moves air across skin, increasing evaporation and creating a breeze that makes an occupied room feel cooler. It does not remove heat from the room or lower the air temperature. ENERGY STAR states, “Remember, ceiling fans cool you, not the room. So, turn them off when you leave the room.” The statement appears in its official Keep Your Cool AND Save Your Money this Summer guidance.
Match fan operation to occupancy
- Turn the fan on when someone is in the room and wants the airflow.
- Turn it off when the room is empty; the motor then stops using electricity and the fan stops adding its small amount of motor heat.
- Use the fan with the thermostat setting that feels comfortable rather than lowering the thermostat automatically.
- Keep blades clean and make sure the fixture is secure; a wobbling or noisy fan is a maintenance issue, not a reason to run it continuously.
ENERGY STAR says that raising the thermostat by two degrees and using a ceiling fan can lower air-conditioning costs by up to 14 percent. That is the agency’s potential-savings claim under the stated condition, not a guarantee for every household. Actual results depend on humidity, fan placement, thermostat location, insulation, electricity prices and whether occupants tolerate the higher setpoint.
Fans and air-conditioning work differently
Use a fan for personal comfort, not as a substitute for removing heat or moisture. If the room remains hot after the fan is on, investigate solar gain, equipment operation, duct or envelope problems and humidity rather than adding more fans. A fan cannot correct an air conditioner that is undersized, malfunctioning or unable to drain condensate.
5. Leaving cooling controls and avoidable air leaks unmanaged
The final routine is less visible: air conditioning may run when nobody needs it, doors and windows may remain open while conditioned air is escaping, or gaps in the building envelope may let hot air enter. ENERGY STAR recommends smart thermostat controls and says sealing air leaks and adding insulation may save up to $190 a year. That is a maximum potential saving stated on the agency’s summer guidance page, not a current guaranteed result for a particular home. The relevant page is ENERGY STAR’s summer guide.
Start with free control checks
- Check the thermostat schedule, away setting and temperature sensor location. A schedule that calls for cooling while the home is empty wastes energy; a sensor near a sunny window may misread conditions.
- Keep exterior doors and windows closed while air conditioning is operating, except for a deliberate ventilation period when outdoor conditions are suitable.
- Make sure supply vents and return grilles are not blocked by furniture, rugs or curtains.
- Replace or clean the filter at the interval specified for the HVAC equipment and household conditions.
- Use a smart thermostat only if it is compatible with the system and its automated schedule reflects actual occupancy.
Do not make a large thermostat jump without considering indoor humidity, health needs and the equipment manufacturer’s instructions. A setting that saves energy but leaves a vulnerable occupant overheated is not a successful routine.
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Find and address leaks methodically
Common leakage points include weatherstripping around moving doors, window frames, attic hatches, plumbing penetrations and joints between conditioned and unconditioned areas. Small DIY sealing projects can be inexpensive, but combustion appliances, electrical penetrations, roof assemblies and inaccessible insulation may require a qualified professional. Sealing without a ventilation plan can also reduce intentional fresh-air exchange, so follow local codes and equipment requirements.
Insulation and air sealing are longer-term improvements, not a quick substitute for closing a shade or changing a thermostat schedule. An energy assessment can identify whether the dominant issue is leakage, inadequate insulation, window solar gain, duct loss or equipment capacity before money is spent on upgrades.
Room air-conditioner warning signs
For a room air conditioner, ENERGY STAR advises proper sizing and installation. An oversized unit can cool the air quickly while removing less humidity, leaving the room damp or clammy. Poor installation can leak air around the unit and undermine cooling. Follow the manufacturer’s sizing and installation guidance rather than choosing the largest available capacity. See ENERGY STAR’s room air-conditioner guidance.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.A practical summer routine by time of day
A simple sequence prevents the five habits from working against one another without requiring a new product.
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- Before direct sun: close coverings on windows that will receive sunlight. This blocks solar gain before it enters.
- Before cooking or bathing: start the range hood or bathroom fan, and choose a lower-heat cooking method when safe and practical.
- While a room is occupied: use a ceiling fan for personal comfort and set cooling controls to a reasonable, compatible temperature.
- After cooking or bathing: allow exhaust to clear heat and moisture, then switch it off within about 20 minutes unless continuous operation is intended.
- When leaving: turn off the ceiling fan, close doors and windows while cooling runs, and let the thermostat schedule handle an empty home.
This sequence is deliberately climate-aware. In a hot, humid location, do not add nighttime window ventilation simply because it is a common tip; compare outdoor temperature and humidity with indoor conditions first. In a dry climate with cool evenings, controlled ventilation may be useful, but it should still be secure and compatible with the home’s cooling strategy.
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If the home still feels hot
The room is hottest near a window
Check whether direct sun reaches the glass during the hottest period and whether the covering closes tightly. If the window is already shaded, inspect for air leakage and compare the room with other orientations. Replacing windows is a major expense; first determine whether shading, weatherstripping or insulation addresses the actual load.
The air feels damp or clammy
Check whether bathroom and cooking moisture is being exhausted outdoors, whether a room air conditioner is oversized, and whether condensate is draining correctly. Lowering the thermostat alone may not solve excess humidity and can overcool surfaces. A qualified HVAC technician can evaluate equipment performance when basic checks do not explain the moisture.
Cooling runs but rooms remain uneven
Look for blocked returns or supplies, open doors to unconditioned spaces, filter restrictions and thermostat placement. Duct leakage, inadequate insulation or equipment faults need diagnosis rather than a higher fan speed or a permanently lower setpoint.
Outdoor air seems cooler at night
Use it only when outdoor temperature and humidity are favorable, air quality is acceptable, and the home can be secured. DOE specifically warns that ventilation is not effective cooling in hot, humid climates, where open windows can add moisture instead of relief.
What to spend money on—and what to change first
| Option | Typical decision | What it addresses | When to consider it |
|---|---|---|---|
| Use existing shades, fans and exhaust correctly | Free routine adjustment | Solar gain, perceived comfort, cooking and bathing moisture | Always the first step |
| Replace or add window coverings | Purchase and installation | Solar heat through particular windows | A room overheats near sun-exposed glass and existing coverings are inadequate |
| Smart thermostat or improved scheduling | Purchase plus compatibility check | Unnecessary runtime and inconsistent occupancy settings | Schedules are irregular or the current control lacks useful away settings |
| Air sealing and insulation | DIY in accessible areas or contractor work | Infiltration and heat transfer through the envelope | Persistent drafts, high attic temperatures or an assessment identifying envelope losses |
| Efficient windows or HVAC equipment | Major project | Solar gain, capacity, efficiency and humidity control | Existing components are failing or an assessment shows replacement is justified |
Do not buy a product merely because it appears on a summer checklist. Match the intervention to the mechanism: shading for sun, exhaust for short-lived moisture, fans for occupants, controls for runtime, and envelope or equipment work for persistent loads.
Bottom line
Close sun-facing coverings, avoid unnecessary indoor appliance heat, exhaust cooking and bathing moisture for a limited period, switch off ceiling fans in empty rooms, and manage cooling schedules and air leaks. These adjustments are supported ways to limit heat gain and improve comfort, but the size of the benefit depends on the home and climate. If discomfort continues, diagnose sunlight, humidity, leakage and equipment sizing before paying for a larger cooling system.
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