I really hate to keep beating a dead horse, however, Sugabear got it 100% right in his previous quotes. Namely, it ain't gonna cost you nothing and has no bearing in a residential setting.
But don't take my word for it, I was only an Licensed Practicing Electrical Engineer for over 25 years before I retired. Instead here's a quote directly from BC Hydro, you know them, they provide most of the electricity to the fine folks in Canada....
"BC Hydro will add a surcharge to the electrical bill of commercial and industrial customers who do not maintain a power factor of at least 90 per cent. Customers can correct their low power factor through the proper selection, sizing and installation of capacitors."
The operative words here are INDUSTRIAL and COMMERCIAL. Their website also states that increased Power Factors do not lower residential bills or the KWH used in a residential setting. This same info has also been released "Edison International" they're the nice people that own and operate "Palo Verde Nuclear Generating Station" the largest nuclear generating facility in the US. Just go to your own power companies website and do a search for "Power Factor", you'll more than likely come up with the same info. I checked PSE&G and Con-Ed and they both had similar data.
OK, that was my last comment on the subject. : SORRY.