What type of thermostats should I use for my house I have my a/c separate from the heater

What type of thermostats should I use for my house. I have my a/c unit seprate from the heater unit

More info,please,, what kind of heat,, forced air,or what,, tell us more on what you have

[QUOTE=wmproop]more info,please,, what kind of heat,, forced air,or what,, tell us more on what you have[/QUi live in a mobiel home the heat system or center is inside the house, and the a/c unit its out side. But when I turn the heat it takes about 5-6 min then it turns on but my a/c does not. Can you help me please. What can I do

You need to call in a expert,you could need a tstat,, and matbe not. Have you checked breaker to a/c?with tstat set on cool/auto fan does anything run?if indoor fan in furnace comes on go outside and see if anything running,, will probably save you $$ if you know nothing about your system to call out a HVAC company,, good luck