So, my SO and I have a roommate. I charge her only $500 all inclusive, meaning her portion of the light bill and everything else + rent is all in one. We live in a nice 3bed/2bath house, approx. 1500 SF. All things considered, she is a great roommate. Takes care of our dogs while we're gone or at work and she's home, cleans up after herself, and gets in cleaning moods like I do which helps keeps things tidy. Plus, we've been friends for like 7+ years and she's a really cool chick that I get along with and can just shoot the shit with.   


However, I have had issues with her lately. At first, it was no big deal, but I feel as though she's grown too comfortable living all inclusive. The main issues are her either forgetting huge loads of trash that need to be out for trash pickup, leaving the lights on when she leaves a room or leaves the house, and running the heater too much. The trash will stink up the whole house, mainly because she will throw her old food out and it will sit there while we're both at work. Minor inconvenience, but still something I feel like she should have a little more responsibility over. In regards to the lights and heat, she knows, or at least by my assumption knows, that I am very frugal when it comes to saving $$. I constantly have to make sure lights aren't left on before we go to bed, and have to walk behind her in the kitchen/common areas. I don't run the heat unless it is god awful cold in the house, because we all have a shit ton of blankets and she has a space heater (of which I am paranoid about because she leaves the light on, who says she doesn't leave that plugged in). I have since justified turning the heater on for shower purposes, but for me - I turn it off as soon as I get out, she leaves it running for 30+ minutes longer. That shit costs money, and it's much more than my usual electric bill. I used to average $60 a month, maybe $85 in the summertime, and since she has moved in it has constantly been above $130. Highest was $190 and I almost had a stroke. It was understood that in order for me to continue letting her rent at only $500 that everything else be kept in check. Other than money reasons, would you not suggest it's common courtesy since she's renting from me and it's my house?  


Last night, my SO and I had gotten home first, assuming roomie was at the gym. Nobody was home, we got in the shower, and then got out to go knock out dishes. We were talking about how it just aggravates me that I feel that simple requests go undone, and I said something along the lines of: 'she really has no idea what she's in for when she moves out because $500 all inclusive seems like a steal to me. I don't feel like I'm asking much. Her and (boyfriend) are in for a rude awakening when they come to find out they'll need to work 2-3 jobs and probably still live paycheck to paycheck (because rent in other places outrageous even being a college town). But to each his own'. Now, what I said I don't feel like was mean, but if she DID hear us, she also didn't get the full context of the conversation that we had in the car. I had an extremely bad day, so admittedly my tone probably sounded bossy and distraught. She's not the type to confront me about what she heard, but rather it will go unsaid and there will just be obvious tension. My SO was about 10ft from me in a different room, talking about a different subject, and then he heard her cough. Instant lump in my throat because I want to explain myself based on the misconception of what she may have heard.  


Now, I've received feedback stating that maybe I'm just being an overly-OCD asshole landlord, but I don't feel as so. Maybe you can offer more feedback or offer similar situation that you have been in. I really try very hard not to be so nit-picky and asshole-ish, but I feel like my behavior and reactions are justified because it doesn't make sense to hike up my electric bill while her rent would not change.  


Thoughts?  


TL;DR roommate has gotten very lax with her living responsibilities; I have voiced it to my SO many times; we were having an in-depth conversation about her, only to find out she was home the entire time basically and we are 99% sure she heard us. She usually chit chats here and there, and we didn't see her all night and she has left me on read all day. 