when did central heating become common

Keyword Analysis

Keyword	CPC	PCC	Volume	Score	Length of keyword
when did central heating become common	0.77	0.8	8339	41	38
when	1.93	0.8	9041	82	4
did	1.55	0.2	8516	13	3
central	1.97	0.2	1397	78	7
heating	1.76	0.4	2094	65	7
become	1.77	0.1	3776	83	6
common	1.12	0.1	446	95	6

Keyword	CPC	PCC	Volume	Score
when did central heating become common	0.99	0.5	1191	42
when did central heating become common uk	1.72	0.7	3367	19
when did houses get central heating	1.43	0.5	6448	72
history of central heating	0.92	0.2	3336	57
when was central heating invented	0.02	0.1	2799	46
history of central heating uk	1	0.1	160	39
when was gas central heating invented	0.21	0.7	1138	55
early central heating systems	1.87	0.4	4013	39
who invented central heating	1.87	0.9	8704	23
who created central heating systems	0.71	0.7	6376	92
who invented the central heating system	0.32	1	2790	77
when was central heat and air invented	1.4	0.2	1307	13
first central heating in uk	1.06	0.4	2581	40
first time central heating	0.97	0.3	1436	59
first central heating systems	0.58	0.9	8614	47
central heating on all the time	1.98	0.6	6750	26
inventor of central heating	1.84	0.5	7599	38
history of heating and cooling	1.98	0.4	3635	41
history of heating systems	0.48	0.4	1337	86
when did central air conditioning begin	1.1	0.5	7142	40
central heating comes on by itself	0.8	0.4	9753	79
history of heating homes	0.82	0.5	5525	71
history of home heating	0.34	0.9	4853	62
central air conditioning history	1.02	0.5	7584	70