Dreams of a thermos signify that you are attempting to control and/or maintain your energy level.

If you are attempting to keep something hot/warm, you are wanting to keep the passion alive.

If you are trying to keep something chilled, you are trying to keep things cool and calm.... Strangest Dream Explanations

To see or use a thermos in your dream, suggests that you are looking to easily and conveniently satisfy your emotional needs.... My Dream Interpretation

Vision: This practical device can keep “warm feelings” warm longer, or “cold feelings” cold longer. What is it in your case?... Dreamers Dictionary

See “temperature”... Dream Dictionary Unlimited

A thermostat regulates heat and may signify an uncomfortable situation that leaves you cold.

To turn up the heat in the home in a dream would suggest that you want to warm up to guests or provide a cozy atmosphere.

A broken thermostat may reflect difficulties in regulating or controlling your environment or your mood.... Ariadne's Book of Dream

To see/read a thermostat in your dream symbolizes arguments with family members.... My Dream Interpretation