What people refer to when they use the terms double hets are het for two distinct recessive trait for example DH albino pied.
To produce a double recessive animal such as an Albino Pied you would need to pair two DH Albino Pied together for a 1 in 16 chance per egg to produce an Albino Pied.
It really comes down to budget, pairing DH is usually the cheaper route, after that if you wanted to produce an albino pied you could do
Pied Het Albino x DH Albino Pied
Albino Het Pied to DH Albino Pied
Pied Het Albino x Albino Het Pied
Etc
Bottom line if you want to produce a Double recessive (which are harder to produce and keep their value longer) you have to have animals carrying the trait for both genes aka Double Het
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