I'm going to try and stay general. Pots shouldn't be left on floor if it can be helped, coldest spot in room - leading to cold roots. Are you attempting a holding action or want winter growth. You give no temperature numbers and no pictures. Do you use lights? Leaves should be well lit but not necessarily hot, or you'll get leaf drop. Air temperatures for indoor growing should be in a 72 to 85 degree tops range indoors, your soil temperature should be above 70 at all times. there should NOT be a huge differential but there generally is some. You need a thermometer for air and soil. You won't be watering as often indoors as outdoors in wind and sun, possibly only once a week in winter but pot should be flooded when you water to get lower pot moist - encourage root growth and flush out any fertilizer salts. Soil i supposed to hold moisture for a while and then dry out from the top down - just like the garden. You need to test - I use cheap wood BBQ skewers and poke in the soil all the way down to bottom to watch for wetness depth. Small pots dry out quicker than big ones. lots of variables. You can shine a cheap clip on spot light on roots/top of pot to warm them so they can supply needed water to leaves if needed. Some people here successfully keep their trees in a very cool state - probably in the 50 degree range (I'm not one of them - someone will chime in), without too much light, and not too much differential between air and soil temps as a holding action - little to no growth and hopefully no leaf drop .

I have the temperature set to 72, and i leave the plant in the natural light for as many as hours as i can but i also use a grow light for about 7 hours/ day. i am hoping for growth over the winter- so if you have tips for that as well i would greatly appreciate that. thank you for your response.

Many potting soils labeled for citrus hold onto too much water for citrus, especially indoors over the winter, do a search for the 511 mix, also what size pot do you have it in and what size is the tree? A picture is worth a thousand words if you can post one. You dont want and overly large pot, and make sure it has plenty of drainage holes in it and dont let it sit in water in the tray after you water it.

the plant is about a foot 1-1/2 feet and around 18 months. i hope these photos help

pots probably a bit large