The views, less street noise, pretending you live in a luxury penthouse... experiencing the high-rise high life is great. Until you realize you don't know how to keep a top-floor apartment cool in summer and it's 90 degrees outside.
If you have AC then that is great, but it is also costly to run, and we should point out it isn't the most environmentally friendly way to stay cool either. Likewise, if you have the best fan, there is only so much it can do on its own in the very hottest weather.
Luckily, we have a load of tips and tricks up our sleeves to help you cool down your high-rise home. From quick hacks to cool a room down fast, to ways to prevent it from getting too warm in the first place, read on and you will be set for a more comfortable summer in the city.
Why is it so hot on the top floor?
There are a couple of reasons why high-rise apartments or those on the top floor get so hot. Firstly, hot air rises.
The other main reason is passive solar gain. This is a fancy way of saying that trapped heat from sun exposure makes a space hot. We can use it to our benefit in winter, but in the summer months it can make a space unbearable. And the reason why top-floor apartments are so susceptible to it? They are less shaded and will get more sun than lower floors.
Plus, if you live in a gorgeous old loft or brownstone, likely those big old windows are not very good and stopping (and keeping out the heat).
How to keep your top floor apartment cool
So how do you beat the heat in a top-floor apartment or high-rise home? We have a number of methods, from those that are quick and effective when the room is already too hot, to those that will help stop it from getting too stuffy in the first place.
1. Vent and get air circulating
When it is hot and the air is still, a room can feel stifling. Creating a bit of draught and getting the air circulating around your apartment is a good way to ease the heat. Open the windows to help hot air escape and prop doors open to aid ventilation. The pressure difference between inside and out should also help cool air rush in, but you may need to open windows on opposing walls to encourage this and get a through-flow of air.
2. Make your fans work harder
Fans can't cool air, only shift it around, but there are ways to optimize the use of your fan to disperse the heat and bring a cool breeze. First, think about fan positions. A fan on the floor will lift the cooler air that is lower in the room.
Then, try angling your fan at the window to push the hot air out. If you have two fans you can create good flow by getting one aimed towards and one aimed away from the window to push out hot and draw in cool. This is even more effective if you have two windows opposite one another. And finally, you can make your fan blow cold air by putting a bowl of iced water or frozen water bottles in front of it. The fan will circulate the cooled air coming from the ice.
Ceiling fans are also a great alternative when you don't have an AC unit or are looking to cut back on your energy footprint. 'Make sure to run fans counterclockwise during the summer months, as this motion has the potential to cool the room by 4-7 degrees F,' explains Steve Truett, president of Aire Serv (opens in new tab).
3. Use air con and windows strategically
The cost of installing air con and running it can be pretty high, so weigh up whether the air con or an open window will be the better option for cooling. This will depend on the time of day and whether it is cooler outside than in.
'One thing that may seem obvious, but that often isn't done, is simply to open windows when the temperature is lower outdoors than indoors,' explains Allan Lake, Founder of Good Guys Heating, Cooling and Plumbing (opens in new tab).
If we have AC we tend to think this is the best solution, but that is a costly assumption when outside is, in fact, cooler.
'Why would someone be using AC when it's colder outdoors than inside? It's likely because they want to cool down the house before going to bed, and their insulated home is still retaining heat from the warmer part of the day,' says Lake. 'Being aware of the situation and opening windows beforehand could reduce or eliminate the need for AC.'
Just remember to shut the windows if you do run AC, and also keep windows shut if it is hotter outside than in to keep the interior cool.
4. Turn off appliances and lights
Running the dryer, dishwasher and oven multiple times throughout the day can produce a lot of heat in the home. Finding simple alternatives like air-drying clothes outside instead of in the dryer or, handwashing dishes can help conserve energy and reduce heat around your apartment in general.
Also consider how much heat energy-inefficient lighting produces. According to Truett, old incandescent lights are major players in heating up apartments as they give off 90 percent of their energy as heat, contributing to 12 per cent of your energy bill, so it's worth looking to smart lightbulbs that are great when it comes to energy efficiency.
By choosing an LED or curly CFL (compact fluorescent lamp) light, you can reduce wasted heat and cool the room down, they use 75 percent less energy and last 10x longer) or LEDs (use 80 percent less and last 25x longer) for substantial savings and a cooler apartment space.
5. Shut doors to lower floors and sun-traps
Though the rise of hot air is unavoidable in an apartment block, keeping doors between floors shut will minimize this problem. (And this should be done for fire safety reasons anyway). If your lobby or entryway feels warmer than your apartment, keep the door shut and minimize opening it too much throughout the day.
Keep the door shut to any rooms of your apartment that get particularly hot (perhaps they face the midday sun), especially if they are not used much or only used for short periods of time. That will prevent them from causing a rise in the overall temperature of your home.
6. Keep blinds and curtains closed
A big part of keeping an apartment cool is preventing the temperature from rising in the first place. As we mentioned before, passive solar gain is one of the main culprits so shut your window dressings to minimize heat.
Black-out curtains or cellular blinds that are designed to keep in heat – and thus keep it out – will be even more effective than lighter dressings.
7. Ask your property owner about insulating the roof
If you are on the very top floor, not only will you be facing heat from any external walls, but from the roof, too. If the void between the roof and your apartment is poorly insulated, the heat gain and loss will be very noticeable.
Suspect this is an issue? Talk to your landlord or property owner. It is in their interests to make sure the building is efficient. And it will reduce your energy costs for heating in winter. Be equipped for the conversation by learning a bit more about roof insulation.
8. Control humidity
Humidity can make a hot home feel warmer and sticky. If humidity is a frequent problem for you, buy the best dehumidifier and set it up in the middle of the room with all doors and windows shut. They are a good investment for winter too if you struggle with condensation which can cause mold.