I'm renting a townhouse, and I've noticed that the upper two floors get about 6 degrees F hotter than the main floor, especially on warm days. I'm unable to install any air conditioners, including portable ones, because the windows are casement style and too large to accommodate a seal. Plus, I can't make major modifications since I'm renting. The main floor has a mini split air conditioner that does a decent job of keeping it cool. I've already tried several solutions, including using powerful fans, window fans at night, applying reflective film on windows, thermal curtains, shade over the roof deck, and experimenting with keeping doors open or closed in the bedrooms. Any suggestions to help cool down the upper floors? It's especially important for me, as I have a newborn and need a stable bedroom temperature.
3 Answers
Have you thought about the insulation and airflow in your townhouse? It could be that the upper floors are suffering from poor insulation, and hot air rising is just making it worse. Try using fans to create negative pressure, pulling cooler air from downstairs into those upper rooms. Just a heads up, if you're concerned about the landlord, you might want to double-check your lease about installing any portable units; sometimes those restrictions aren't as enforceable as you think.
I totally get what you're dealing with; I had a similar experience in a townhouse! Thermal curtains can really be a game changer, especially if you keep them closed all the time. You could also try keeping doors open to promote better airflow. I even drilled in curtain rods for mine, but just patched and painted when I moved out. As for fans, just be mindful about running them all the time with the baby around.
Honestly, the heat variance is pretty common in multi-level homes. If you're really stuck on the air conditioner front due to window sizes, consider venting a portable AC through a window if you can. You might need some insulation tape for the gaps. However, do keep an eye on humidity if you try this, especially with baby care in mind.