Is it helpful or harmful to create SEO filler pages?

I'm not sure exactly what these "filler pages" are called, so I couldn't do a proper search.

If I have a business, say a plumbing/heating company in NYC, and I created these HTML pages:

New-York-City-plumbing-company.htmlManhattan-plumbing-company.htmlBrooklyn-plumbing-company.htmlNew-York-City-heating-service.htmlManhattan-heating-service.htmlBrooklyn-heating-service.html

and the content for each page type was the same, except the name of the city/neighborhood changed, i.e.

<h1>[Neighborhood] Plumbing Company</h1><p>description of plumbing service</p><h1>[Neighborhood] Heating Service</h1><p>description of heating service</p>

Would this be helpful, harmful, or neutral in terms of SEO? I'm a little afraid Google might see that 95% of the content is the same, minus the name of the neighborhood, and punish my site for it.