Any way to get iframe to get height to autofit content on page?

I used iframe html code to place a outside hotel search function on one of my WP pages. I was able to get the width to be perfect however the height is off. If I use 100% it only shows small piece of the content, if I use say 1000px I get the entire homepage but when I click on search the search results push the page to 1500px which means that if I enter 1500px to compensate for the search page then the homepage has about 500px of empty space which looks very unprofessional. Is there any code or anything I can use to autofit the content on the page? I herd iframes and wordpress do not play well together but I’m not a tech guy so wanted to get help from the pros.
Thanks