Aside from citronella oil, what other pinoy homemade repellants can you recommend to be placed inside the living room?

You can try using potted plants as a safe insect repellant. Herbs like mint, rosemary, lavender, and basil have insect repellant properties. Plus, you get to have delicious fresh herbs that you can use for cooking!

You can try homemade insect repellant freshener by simply drying citronella and mint leaves and wrap them in a cloth bag which you can hang near your ventilation. :)