Heat pump SEER rating

It's because we use 120/240 volt 60 Hz two-phase.  Your single-phase 50 Hz is less efficient.

I don't believe you. There is no way they can be twice as efficient with a different input voltage or frequency.

That doesn't explain why Panasonic (which are good aren't they?) are manufacturing a product which is not much better than half as good as the minimum required by US law. Is it old s*it they're selling to other countries because the Americans aren't allowed to buy them?

You are right and that guy is wrong on several things. To start with we have single phase, just like you, just a slightly different frequency. Conventional HVAC units run on 240v. It really doesn't matter tho if the motors are optimized for the frequency. If you buy a mini split it doesn't matter at all. They use inverter supplies and convert the voltage to DC as soon as it gets inside. Then it is converted to the voltage they need for the unit.

Thought so. So why are Panasonic making such inefficient units? Are they just cheaper versions that are only available to buy outside the US? For example this is £450, and has a SEER of only 7.5, whereas your law specifies 13 minimum:

But they get used for heating here too, and will be a lot more as houses built after 2025 cannot have gas boilers by some stupid EU treehugger law. I'm already seeing new houses with heatpumps installed.

I want it for both. It's not clear from the Panasonic I was looking at what mode the SEER applies to.

Europe and possibly UK are all different which will give very different figures.

Yes, but I'd expect the best SEER rating to be quoted if they only quote one.

But we might end up keeping the stupid law.

I f****ng hope not, that stupid SNP woman was told no once.

But can still work out cheaper than gas.

It isn't. Go here and click specifications:

Surely all SEER are the same, all EER are the same, and all COP are the same?

Doesn't it also depend on if it's been optimised for air conditioning to cool air in the summer rather than being optimised for heating during the winter in climates such as the UK?

Consider also it appears from many of the examples I've seen honesty doesn't seem to be part of USA advertising.

Is that necessary? If it's reversible, isn't it just that? Obviously it will be less efficient when it's pushing heat through a larger gradient (which will happen in heating mode), but that can't be helped.

Don't they have a government body to check they're honest?

And it ain't just the USA - almost everything you buy with a rating is a lie. Cameras with less megapixels than they say, batteries with less capacity than they say, etc. Every time I buy something like that, I test it thoroughly, then get a partial refund :-)

Yeah, could well do given you lot have your own stupidity with electric cars.

But clearly doesn't care and is demanding another.

And presumably another until she gets what she wants.

Sure, that was just a comment on your original about why you see what you see with SEERs, not saying that it isnt worth doing that way.

If my place wasn't passive solar by design I likely would have a heat pump myself.

Not because of any ban on gas, we arent stupid enough to do that, but because the gas price has hiked very dramatically here.

I don't have gas connected to the house but it is available down the street if I want it.

Bet it is.

It will be somewhere else with an operation like Panasonic.

From Wikipedia "In the United Kingdom, a Seasonal Energy Efficiency ratio (SEER) for refrigeration and air conditioning products, similar to the ESEER but with different load profile weighting factors, is used for part of the Building Regulations Part L calculations within the Simplified Building Energy Model (SBEM) software, and are used in the production of Energy Performance Certificates (EPC) for new buildings within the UK and the European Union; both as part of the European directive on the energy performance of buildings (EPBD"

Since most of this stuff comes from China anyway I would be surprised it is that much different if at all. This really might just be the way they get rated in UK. I know most HVAC people say that SEER thing is bullshit anyway as soon as they get away from the salesman..

Must be your age.

So if he compared the EERs, he'd get a fair comparison between those sold in the US and UK?

Does the US have a regulation on minimum EER?

What stupidity would that be?

Shouldn't be allowed. The vote should have been binding for x years.

The SEER for cooling is always higher. This is the one the USA is presumably making laws about, as they use them for AC a lot. It's also (since it's higher) the one that the company would quote, surely?

Your house is entirely heated by the greenhouse effect through windows? Don't you ever get a few days in a row with no sun?

Yip, price should always be the deciding factor, it sorts things automatically. As stuff becomes scarce, cheaper alternatives are found.

Thought you loved cooking? Many cooks seem to prefer gas.

Find it then.

Ah, so SEER is calculated according to likely weather locally? Doesn't that mean if I looked at the exact same model for sale in two countries, the SEER rating would be different?

It does not make sense to have SEER be different depending where you live. How then can a product have a rating? They don't know whether you're going to install it in Texas or wherever. They'd have to say "SEER (Texas) 17, SEER (Washington) 15" etc.

ISEER is profiled in Indian weather. SEER is presumably defined on American weather (which is daft as America has vastly different climates across it). So what is sensible in the UK? I think I'd be better off comparing COP. It doesn't have any input from the seasons, so is better for directly comparing two AC units from different manufacturers.

Like miles per gallon on cars? Some manufacturers lie more than others?