Your house is most likely doing absolutely fine: the problem is most likely the potting medium.
My mother bought two Peace lilies last year. They are placed about 5ft apart in the same room, so same moisture, same light, same everything. But one needs watering every 10 days at most while the other needs watering maybe once a month in the hot season and perhaps twice during the whole Winter.
What's the difference? The potting medium.
The trend among many industrial-scale nurseries, the kind that propagate Peace lilies, Monsteras etc by the thousand for the retail market, is to use potting compounds that will increase the water-holding capacity of the soil because, well, most people water their plants only when they remember they have a potted plant.
When these plants get to the shop, they get watered "regularly", meaning the bloke tasked with watering potted plants will water them when told, which may mean three times or more a week. Your Monstera is still feeling the effects of this overwatering: that is why it's yellowing.
The only thing you can do while you wait for the soil to dry out is to make sure moisture doesn't get trapped under the vase.