I worked really hard to cover every base, had the fans upgraded, installed humidistat switch/sensors, increased venting and vans in the laundry area (next to the bathroom), and even bought a de-humidifier to go into the unit as well as reminding my tenants to run the fans, keep the windows open in the bathroom, etc.

I repaired both my washer (filter) and dryer (temp sensor) and they lasted 5+ years after my repair.

We own a digital business card platform called Tendant with a power user version that allows you to build reusable lists of contacts on your phone.

You have to consider that everyone is different so everyone has a different sensor. 

Here are a few other NOI increasing tactics that haven't been mentioned:- Charge for parking- Charge for late fees- Charge for application fees- Charge more for more desirable units (e.g. 3rd floor vs. 1st floor)- Reduce electric bill with motion sensor lights- Seek triple bids for vendor costs- Reduce maintenance costs by replacing all light bulbs with high-efficiency bulbs- Charge a move-in / cleaning fee - Contest your tax bills@Douglass Benson @Bill Thompson @Gino Barbaro Have all listed some really good ideas. 

We prepare a move-in gift package that includes cleaning supplies (degreaser, carpet spot cleaner, vinegar, baking soda, magic eraser, disinfectant wipes), cutting board, plunger, hand soap, dish soap, paper towels, and toilet paper, presented in a cleaning bucket and reusable shopping bag. ($30)  At move-in we also loan the tenant the use of drop cloth runners (to protect the flooring on move-in day), furniture moving blankets, furniture sliders, furniture lifting straps, a step stool, and a picture hanging tool kit (with small hammer and picture hooks). 

The rest of the sensors are cheap.

Assuming they are well done, $375 for a set of well-crafted reusable loan documents could be the bargain of the century.

We are all a mix bag of nuts and everyone has different sensors. 

Last time the motion sensor light went out in the backyard he told me about it and promptly went out bought another one and installed it himself.