What temperature, humidity, and lighting setup does a gerbil pair need?
Keep the warm side at 75°F (24°C) and the cool side at 65°F (18°C) with 30‑50% humidity and a 12‑14 hour light cycle; this combo lets two adult gerbils (4‑5inches long) stay healthy for 3‑4years.
Create a reliable temperature gradient
Start by setting the warm corner to 75°F (24°C) and the opposite corner to 65°F (18°C). Gerbils will move toward the cooler side when they feel too hot, and retreat to the warm side when they need extra heat after a sand‑bath. A 10‑inch (25cm) distance between the two zones is enough for a 20‑inch (50cm) cage, letting the animals choose freely. I use a 10‑15watt ceramic heat emitter on a thermostat to avoid hot spots.
Mount the thermostat probe at the gerbil’s eye level, about 2‑3inches (5‑8cm) above the bedding. The thermostat should be set to maintain 75°F, and I check it twice a week with a handheld infrared gun. If the warm side drifts above 78°F (26°C), I lower the wattage or add a small metal screen to diffuse the heat. The cool side never drops below 62°F (17°C), which I verify by placing a second probe in the opposite corner.
- Thermostat set to 75°F (24°C)
- Heat emitter rated 10‑15W
- 10‑inch (25cm) distance between zones
Maintain humidity within the safe band
Aim for 30‑50% relative humidity measured at animal height. I keep the substrate at least 2‑3inches (5‑8cm) deep using a mix of aspen shavings and paper bedding; this depth holds moisture without becoming soggy. A shallow (¼‑inch) sand bath on one side adds a micro‑climate that raises local humidity when the gerbils roll in it.
Ventilation is key: a 2‑inch (5cm) mesh panel on the opposite wall provides airflow without creating drafts. If humidity climbs above 55%, I sprinkle a thin layer of dry wood shavings and increase the fan speed for 10‑15 minutes. Conversely, when it falls below 28%, I mist the bedding lightly with a spray bottle, using no more than 2ml per day.
- 30‑50% RH target
- 2‑3inches deep substrate
- ¼‑inch sand bath layer
Provide appropriate lighting and optional UVB
A 12‑14 hour photoperiod mimics natural dawn‑dusk cycles; I use a programmable LED timer to switch the lights on at 7am and off at 9pm. The LED emits 6500K daylight, which is bright enough for activity without stressing the eyes. Gerbils do not require strong UVB, but a 0.5‑watt UVB bulb placed 12inches (30cm) above the cage can help calcium metabolism if you notice dental wear.
Keep the light source at least 10inches (25cm) away from the bedding to avoid heating the enclosure. Measure light intensity with a lux meter; 300‑500lux at the cage floor is ideal. If the lux reading exceeds 600, I dim the LED or raise the fixture by 2‑3inches.
- 12‑14 hour light cycle
- 6500K LED, 300‑500lux
- Optional 0.5‑W UVB bulb
Measure variables at the gerbil level
Place a digital thermometer and hygrometer on a small platform 2‑3inches (5‑8cm) above the bedding, right in the middle of the cage. Record temperature and humidity at the same time each morning; this consistency catches daily swings caused by room HVAC cycles. I log the numbers in a notebook for at least 30days to spot trends.
If you notice a drift of more than 3°F (1.5°C) or 5% RH over a week, adjust the heat source or ventilation immediately. A quick check with a handheld infrared thermometer can verify whether the warm side is still within the 75°F target. For humidity, a simple desiccant packet (1gram) can be swapped out weekly if levels stay high.
- Thermometer/hygrometer at 2‑3inches height
- Log data for 30days
- Adjust if >3°F or >5% RH shift
Watch for signs that the numbers are off
If gerbils huddle in the cool corner, pant, or have wet foot pads, the warm side is likely below 70°F (21°C). Conversely, excessive digging, lethargy, or red ears indicate temperatures above 78°F (26°C). I intervene by moving the heat pad or adding a cooling tile.
Dry, flaky skin and frequent sand‑bath digging point to humidity under 30%, while moldy bedding, clumped shavings, and a strong musty odor signal humidity above 55%. In both cases I adjust ventilation, substrate depth, or misting frequency. Quick visual checks each day keep problems from becoming chronic.
- Huddle + pant → too cold
- Red ears + lethargy → too hot
- Dry skin → <30% RH
- Moldy bedding → >55% RH
Keep reading about Gerbil: Gerbil care sheet
Related questions
How often should I check the temperature and humidity?
Check both twice daily—once in the morning and once in the evening—and log the readings. If the numbers stay within 75°F±3°F and 30‑50% RH for a full week, you can reduce checks to once daily.
Can I use a regular heat lamp instead of a ceramic emitter?
A heat lamp can work, but keep its wattage at 15‑20W and position it 12‑15inches (30‑38cm) above the cage to avoid burns. Use a thermostat to prevent the temperature from exceeding 78°F (26°C).
Do gerbils need UVB lighting for bone health?
UVB is not essential, but a low‑output 0.5‑W UVB bulb placed 12inches (30cm) above the cage for 10‑12hours per day can help if you notice dental overgrowth. Monitor for any signs of skin irritation and turn it off if the enclosure becomes too warm.
Not veterinary advice. This guide covers husbandry — housing, feeding, cleaning and handling. If your gerbil is injured, off food unusually long, or behaving abnormally, contact a veterinarian.