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The FCC puts severe limits on the power that can be used by devices to transmit data. They are limited to 1/2 the power allowed for things like handheld RF remotes (e.g. HR12A Palmpad). 75-100' line-of-sight is probably near max for devices that are following FCC Part 15 rules. Many of these use

You can probably improve this significantly with a better antenna and a preamp on the receiving end. See the thread on improving RF range from a few days back to get an idea of how much this helps.

I d>a remote temperature transmitter/receiver with decent range? All the ones