For most HVAC companies with several branches, one main domain with a genuinely useful page for each real location is the stronger structure. A separate website earns its place only when a division operates like its own business: its own name, its own offer, its own buyers and enough to say. This guide gives you the reasoning, a scoring test you can run yourself, and the common situations where the answer changes.
Why one domain is the default
The core reason is that the signals search engines use to judge a site don't pool across domains. Links from suppliers and local press, reviews mentioned on your pages, years of published content and the trust built from all of it attach to the site that earns them.
Split a company across five domains and each one starts with a fraction of that. None of them builds the depth that a single site would. Your branches end up competing with each other as well as with your competitors.
There are three practical reasons as well:
- Maintenance. Every site needs hosting, updates, security patches and content reviews. Five sites means five times the upkeep, and usually five sites that are out of date.
- Consistency. Prices, warranties, services and branding drift when they live in several places.
- Measurement. One analytics property and one Search Console view make it far easier to see what works.
A location page on a strong domain also starts life with that domain's reputation behind it. A brand-new standalone domain for the same branch starts from nothing.
What Google's policies say about multiple sites
Google doesn't forbid companies from running more than one site. What its spam policies (last updated August 2026) describe is the purpose behind them.
Under doorway abuse, the examples include running several sites with slight variations to capture the same query, and creating domains or pages for particular cities that funnel visitors to one destination. Under link spam, the examples include excessive link exchanges and partner pages that exist only to cross-link.
Read together, those examples rule out the classic "HVAC network": a set of city domains, each a light copy of the main site, all linking to each other. They don't rule out a real division with its own site, as long as that site exists for its own readers.
The four independence tests
Before giving any brand, division or branch its own domain, score it on four questions. It needs a clear yes on all four.
- Own name. Do customers know it by a different name, seen on trucks, invoices and signs? A name that exists only on a website doesn't count.
- Own offer. Does it sell something meaningfully different, such as boilers only, commercial maintenance contracts or geothermal systems?
- Own buyers. Do its customers search differently? A property manager looking for rooftop unit maintenance asks different questions from a homeowner with a cold house.
- Own value. If the parent site disappeared tomorrow, would this site still be worth visiting? Would it have enough pages that say something new?
Most branches fail test 1 and test 2: they are the same company, selling the same services, in a different place. That's exactly what a location page on the main site is for.
A scoring sheet you can use
Put each candidate in a row and score it honestly.
| Candidate | Own name | Own offer | Own buyers | Own value | Verdict |
|---|---|---|---|---|---|
| North branch | No | No | No | No | Location page |
| Acquired brand with loyal customers | Yes | Partly | No | Maybe | Review the evidence |
| Boiler division | Yes | Yes | Yes | Yes | Separate site |
| City domain bought years ago | No | No | No | No | Redirect |
For the "review the evidence" rows, add numbers: monthly calls, branded searches in Search Console, reviews and real links pointing at the site. If the acquired brand still pulls branded searches and calls, it may deserve a transition period before any merge.
How common situations usually resolve
A second or third branch
Give it a location page on the main site, a Google Business Profile if it's a staffed location, and its own tracked number. Don't build it a website. The page should carry the branch's address or service area, the services it actually offers, and local context your technicians can supply.
An acquisition
This is the hardest call, because the acquired company's site and profile often carry years of reviews and customer memory. The usual path is a staged transition: keep the brand visible while customers learn about the new owner, then move its useful pages onto the main domain with page-by-page redirects. If the brand is a genuine specialist, it may pass the tests and keep its own site.
A specialist division
A boiler, hydronic, commercial or geothermal division that has its own team and its own customers can pass all four tests. GasBoilers.ca, a gas-boiler division built for CANRO Heat, is a working example: it serves 26+ BC communities and has 5.0★ from 76+ Google reviews.
A pile of old city domains
Redirect them. If they carry copied content, they're a liability. If they have a few real links, a redirect to the matching location page passes most of that value to a page that can use it.
Expanding into a new province
Still usually a section of the main site, unless language or regulation forces a different approach. Quebec is the main case to think through, because French content requirements apply to businesses serving Quebec customers.
Where Google Business Profiles fit
Profiles follow the real world, not your website plan. Google's guidelines allow one profile per location, require service-area businesses to hide their address and set a service area, and exclude virtual offices where the business doesn't operate.
So the profile count is set by how many staffed locations you have. Your website structure should then give each profile a matching page to link to. A branch with a profile but no page sends customers to a generic home page; a page with no profile behind it is fine, as long as it's honest about how that area is served.
Mistakes we see often
- Deciding by domain name appeal. A catchy exact-match domain is not a business case.
- Building first, structuring later. Content written into the wrong structure has to be moved, redirected or rewritten.
- Keeping both versions after a merge. If the old site stays live with the same content, the two compete.
- Footer links between all group sites. Widely distributed footer links are named in Google's link-spam examples.
- Ignoring the people side. Branch managers need to know where their customers will land and which number they'll call.
What to do next
Run the scoring sheet on your own company. If every row comes out clearly, you may not need help. If some rows are contested, especially after an acquisition, the site ecosystem architecture service is designed for exactly that decision. When the structure is settled, location pages fill it, and the consolidation guide explains how to retire the domains you no longer need.
Frequently asked questions
Is one domain always better?
No, but it's the right default. A separate domain makes sense when a division has its own name, distinct offer, different buyers and enough substance to stand on its own. Most branches don't meet those tests; some divisions do.
What about subdomains for each branch?
Subdomains add technical overhead without much benefit for a branch. Folders on the main domain, such as a locations section, are simpler to manage and link. We'd consider a subdomain mainly when a division runs on a separate platform.
Does a separate site help us take more spots in search results?
That idea is behind many doorway networks. Sites made mainly to occupy more results for the same searches fit Google's doorway description. A separate site should exist because it serves a different reader, not to crowd the results page.
How do we decide if partners disagree?
Score each brand and division against the four tests and put the evidence beside it: calls, branded searches, reviews and links. A decision made on that sheet is easier to agree on than one made on preference.