  New free energy related signatures of the condensed excitons in Double
Quantum Wells (DQW) are predicted and experiments are proposed to measure the
effects. These signatures are related to the measurement of a conceptually new
kind of force ($\approx 10^{-9} N$) due to the condensate. This force, which
may be coined as the Exciton Condensate (EC)-force is attractive and
reminiscent of the Casimir force between two perfect metallic plates, but also
distinctively different from it by its driving mechanism and dependence on the
parameters of the condensate. The proposed experiments here are based on a
recent experimental work on a driven micromechanical oscillator with a proven
high quality factor. The free energy related measurements are immune to the
commonly agreed drawbacks of the existing photoluminescence experiments. In
this regard, the proposed experiments are highly decisive about the EC.
