While debated, it is generally accepted in SEO community that most search engines analyze text inside heading tags and use it to rank Web pages. They assume that anything important enough to put in larger text is also relevant to the page's content.  The <H1> tag is by far the most important: it describes the purpose of the whole site. Search engine spiders will use it to score your page's relevancy. Make it a more succinct version of your page's TITLE tag and include important keywords. The sub headers decline in importance relative to their size, but they're still useful: be sure you include keywords there too.

Read also: Heading tags and search engine optimization

Do not use heading tags as only a way to format text

Heading tags are not just about font size, Google uses them to determine what text is most important in a document.  If H1s are most important followed by H2s, H3s, H4s, all the way down to H6s, then it would only make sense that you ought to only have one H1 on a single page.  Think about it, you can't tell Google you have two things that are MOST important.  A superlative means you can only have one!  Your H1 tag is generally the title or tagline of your site and this tag is usually built into the template of your real estate blog.  So, you should never use an H1 in your posts.

Never use header tags as a substitute for the FONT tag. Use FONT tags or Cascading Style Sheets to emphasize words on your site. A search engine spider that finds this code:

would assume that your blog page is about "Contact Me" and not about a real estate.

The hierarchy of your heading tags is important

The hierarchy of tags is also important for proper site structure and W3C compliance (FYI: W3C is standards that good web developers try their best to comply with).  For example, W3C says that a well formed site would have an

H1

H2

H3

H2

H3

H4

But never

H1

H3

H2

See how the second set of headings are out of order?  It all matters. You need to decrese and increase tags in order and cannot skip from an H1 to an H3 without putting an H2 in between them.

Resources:

As always, don't take just my word on this, check out the words of SEO experts and their opinions of H1 tags.
Search Engine Ranking Factors
SEOmoz.com Date unknown
Blog SEO Tip #7: Heading tags
Stephan Spencer.com Feb 2006
What Attribute Ranks Better Bold or H1 On A Page?
seoroundtable.com March 2005

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